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AltF Backlinks

Free backlink sites list: 1,964 places to get a link

A maintained list of 1,964 legitimate backlink sites: directories, profile creation sites, guest posting sites, launch platforms, registries and marketplaces. 1,628 are free or have a free tier, 44 usually give a dofollow link, and 781 have an estimated DA of 70 or more. Every row shows authority, link type, cost and effort, and links straight to the submit page.

1,964
Opportunities
1,628
Free or freemium
781
Est. DA 70+
208
Quick wins

1–100 of 100 opportunities

The table is wider than the screen — swipe it sideways for cost, effort and the preparation notes.

Submission opportunities with impact score, cost, effort, priority, status and preparation notes. Scroll horizontally for all columns.
#Impact (sorted)Site — sort by thisEst. DA — sort by thisLinkDomainTypeCostEffort — sort by thisPriorityStatusWhat to prepareRules / caveatCheckedActions
1100ACT Rules Community45Dofollowact-rules.github.ioCommunities and forumsFreeQuickDo firstVerified liveImplement applicable ACT Rules, execute official test cases, publish the implementation report, join ACT-R CG, and propose your tool as an implementation.Requires genuine rule implementation and reproducible results; inaccurate or partial claims will not qualify.Official implementation instructions checked 2026-08-05Open ACT Rules Community submit page (new tab)ACT Rules Community details
2100Content Authenticity Initiative60Link type unknowncontentauthenticity.orgPublishing platformsFreeQuickDo firstVerified liveApply as a company and accurately describe your tool C2PA or content-provenance tools and intended participation.Open membership, but genuine participation is expected; directory may publish the organization name/logo and link.2026-08-04Open Content Authenticity Initiative submit page (new tab)Content Authenticity Initiative details
3100CycloneDX Tool Center55Link type unknowncyclonedx.orgSoftware directoriesFreeQuickDo firstVerified liveAdd standards-valid CycloneDX support, then submit the structured your tool entry through the official contribution workflow.Must accurately state supported CycloneDX versions, functions and licensing; a listing is not product certification.2026-08-05 official CycloneDX Tool CenterOpen CycloneDX Tool Center submit page (new tab)CycloneDX Tool Center details
4100FreeNoSignup—Link type unknownfreenosignup.comSoftware directoriesFreeQuickDo firstVerified liveSubmit one or more free your tool utilities that work without registration.Tool must be active, useful, web-based, privacy-respecting and usable without signup.2026-08-05Open FreeNoSignup submit page (new tab)FreeNoSignup details
5100MERLOT70Link type unknownmerlot.orgOther opportunitiesFreeQuickDo firstVerified livePublish a genuinely reusable privacy or accessibility lesson on your tool, give it a stable URL and open license, then add its educational metadata to MERLOT.The resource must be an online OER with its own URL; subscription-only material is inappropriate. Supply discipline, audience, material type, description, author, license, cost, and accessibility metadata honestly.2026-08-03Open MERLOT submit page (new tab)MERLOT details
6100RapidAPI Hub80Link type unknownrapidapi.comMarketplaces and app storesFreeQuickDo firstVerified liveList a stable your tool API with OpenAPI definitions, clear endpoints, health checks and its official website in the permitted listing field.The API must be functional, accurately documented and securely operated; avoid listing browser-only tools as fake APIs.2026-08-03Open RapidAPI Hub submit page (new tab)RapidAPI Hub details
7100SAYUJ by STPI—Link type unknownsayuj.netStartup directoriesFreeQuickDo firstVerified liveRegister your tool as an Indian startup, complete its offering profile, and use Product Expo or Startup Connect when relevant.Requires email and Indian mobile OTP; STPI ownership does not imply government endorsement of listed startups.2026-08-05 official registration and STPI About SAYUJ pagesOpen SAYUJ by STPI submit page (new tab)SAYUJ by STPI details
886Alfred Gallery50Link type unknownalfred.appDesign galleriesFreeQuickHighVerified liveBuild a privacy-safe macOS Alfred workflow that opens or runs useful your tool actions, publish it on the forum, gather feedback, and seek Gallery inclusion.Gallery submission is invitation-based after community testing; no auto-updater, downloaded executables, unsigned binaries, or unsafe behavior.Official Alfred Gallery submission requirements checked 2026-08-07Open Alfred Gallery submit page (new tab)Alfred Gallery details
986AnkiWeb Add-ons65Link type unknownankiweb.netMarketplaces and app storesFreeQuickHighVerified liveBuild a useful Anki privacy, study-safety, or accessibility add-on, package it as .ankiaddon, and upload it through AnkiWeb.Must be a working desktop add-on; avoid collecting card data, document permissions, and maintain compatibility across Anki releases.Official Anki add-on sharing guide checked 2026-08-05Open AnkiWeb Add-ons submit page (new tab)AnkiWeb Add-ons details
1086Apache Airflow Ecosystem90Nofollowairflow.apache.orgOther opportunitiesFreeQuickHighVerified liveCreate a real your tool Airflow provider with hooks/operators and documentation metadata, publish it, then add it to Airflow’s Ecosystem page by PR.Provider must implement apache_airflow_provider metadata, use unique connection types, be documented and packaged; ecosystem PR is evaluated for community usefulness.2026-08-05 — https://airflow.apache.org/docs/apache-airflow-providers/howto/create-custom-providers.htmlOpen Apache Airflow Ecosystem submit page (new tab)Apache Airflow Ecosystem details
1186Buildkite Plugins Directory70Link type unknownbuildkite.comMarketplaces and app storesFreeQuickHighVerified liveBuild a pipeline plugin that runs your tool checks on selected artifacts and posts configurable pass, warn, or fail annotations.Use a public repository with the required suffix, valid plugin.yml, hooks, tests, and README; add the official topic for directory sync.Official Buildkite plugin writing documentation checked 2026-08-07Open Buildkite Plugins Directory submit page (new tab)Buildkite Plugins Directory details
1286CodePen90Nofollowcodepen.ioProfiles and entitiesFreeQuickHighVerified liveBuild an original interactive demo of an your tool utility, document the use case in Pen Details, and add your tool as one of the public profile links.Public Pens are searchable and MIT-licensed; publish original useful code, not a blank redirect or copied landing page.https://blog.codepen.io/docs/getting-around/your-profile/Open CodePen submit page (new tab)CodePen details
1386CoFoundersLab65Nofollowcofounderslab.comStartup directoriesFreeQuickHighVerified liveCreate a complete founder and startup profile for your tool and participate in relevant founder discussions or connection requests.Use a real founder identity, contribute context before mentioning AltFTool, and never send unsolicited promotional messages.Official CoFoundersLab signup and community path checked 2026-08-07Open CoFoundersLab submit page (new tab)CoFoundersLab details
1486Cybil Knowledge Portal40Link type unknowncybilportal.orgSoftware directoriesFreeQuickHighVerified liveSubmit a genuine international cyber-capacity-building project, tool, publication or webinar with evidence and a live resource URL.Portal staff curate and may validate with participants; must have direct cyber-capacity-building relevance, not be a generic product listing.2026-08-05 — https://cybilportal.org/submit-your-cyber-capacity-building-projects/Open Cybil Knowledge Portal submit page (new tab)Cybil Knowledge Portal details
1586DatoCMS Plugin Marketplace65Link type unknowndatocms.comMarketplaces and app storesFreeQuickHighVerified liveBuild an your tool privacy or security field plugin, publish the npm package, and use your tool as its homepage and support site.The package name must start datocms-plugin-, include the required keyword, and meet Plugin SDK requirements; ingestion is automatic.Official DatoCMS Marketplace publishing documentation checked 2026-08-07Open DatoCMS Plugin Marketplace submit page (new tab)DatoCMS Plugin Marketplace details
1686Directus Marketplace65Link type unknowndirectus.comMarketplaces and app storesFreeQuickHighVerified livePublish a genuine your tool Directus extension to npm and complete author, documentation, support, and website metadata.Requires the Directus extension keyword and metadata; availability depends on supported extension type and matching npm and GitHub author identity.Official Directus Marketplace publishing documentation checked 2026-08-07Open Directus Marketplace submit page (new tab)Directus Marketplace details
1786DokuWiki Plugins70Nofollowdokuwiki.orgMarketplaces and app storesFreeQuickHighVerified liveBuild a DokuWiki privacy, redaction, accessibility, or secure-export plugin, publish its code and create the canonical plugin page used by the extension directory.Must be an installable maintained plugin with accurate compatibility, download, source, license, and security information.Official DokuWiki extension pages and plugin wizard checked 2026-08-05Open DokuWiki Plugins submit page (new tab)DokuWiki Plugins details
1886Eclipse Marketplace90Nofolloweclipse.orgMarketplaces and app storesFreeQuickHighVerified livePublish a functional Eclipse plugin for an your tool developer use case, then create a complete marketplace listing with official support and source links.Requires an Eclipse account, a working installable plugin and compliance with marketplace content and trademark rules.2026-08-03Open Eclipse Marketplace submit page (new tab)Eclipse Marketplace details
1986FOSSRadar—Link type unknownfossradar.devOther opportunitiesFreeQuickHighVerified liveAfter open-sourcing a maintained component, submit the TOML project file and website through GitHub PR.Must be India-founded, India-maintained or serve Indian users; repository and license are required.2026-08-03Open FOSSRadar submit page (new tab)FOSSRadar details
2086Fourthwall70Nofollowfourthwall.comOther opportunitiesFreeQuickHighVerified liveOffer a substantial free privacy checklist, accessibility workbook, or safety template from a branded storefront and link your tool only as supporting documentation.Publish useful rights-cleared products rather than thin promotional downloads; payment rates vary and the free plan has listing limits.Official Fourthwall digital-products, pricing, and terms pages checked 2026-08-07Open Fourthwall submit page (new tab)Fourthwall details
2186Framer Marketplace85Nofollowframer.comMarketplaces and app storesFreeQuickHighVerified liveCreate a functional Framer plugin for accessibility, metadata, responsive-content, or privacy checks and publish it with your tool documentation.Test in fresh projects, package the real plugin, provide accurate screenshots and descriptions, and maintain every published version.Official Framer plugin publishing documentation checked 2026-08-07Open Framer Marketplace submit page (new tab)Framer Marketplace details
2286Frappe Cloud Marketplace65Link type unknownfrappe.ioMarketplaces and app storesFreeQuickHighVerified liveBuild a useful your tool-related Frappe app, publish it through Frappe Cloud Marketplace, and include the official project/site link in its genuine listing.App must be open source under an MIT/GPL-compatible licence, stable on Frappe, pass CI, provide support/privacy URLs and accurate imagery/demo; do not use the listing as a link-only redirect.2026-08-05Open Frappe Cloud Marketplace submit page (new tab)Frappe Cloud Marketplace details
2386Frontend Mentor65Nofollowfrontendmentor.ioDesign galleriesFreeQuickHighVerified liveComplete a relevant accessibility or privacy-themed challenge, submit its real live URL and public repository, and add your tool only as maker context or a case-study link.The submission must solve an actual challenge; a live URL and public repository are required, so never upload secrets or private code.Official Frontend Mentor submission and plan guidance checked 2026-08-07Open Frontend Mentor submit page (new tab)Frontend Mentor details
2486Glasp55Nofollowglasp.coProfiles and entitiesFreeQuickHighVerified liveCreate a founder research profile that curates authoritative privacy, accessibility, security, and standards material, including your tool only when it directly supports the annotation.Free-user highlights are public by default; never add confidential data or secrets, and maintain balanced curation instead of a self-link collection.Official Glasp pricing and highlighting guidance checked 2026-08-07Open Glasp submit page (new tab)Glasp details
2586Global Accessibility Awareness Day30Link type unknownaccessibility.dayOther opportunitiesFreeQuickHighVerified liveHost a genuine public accessibility learning or testing event and submit its dates, description and your tool event URL.The event must be real and accessibility-focused; use a public event page, not a disguised product listing.2026-08-05 — https://accessibility.day/submit-your-eventOpen Global Accessibility Awareness Day submit page (new tab)Global Accessibility Awareness Day details
2686Hexo Plugin List75Link type unknownhexo.ioMarketplaces and app storesFreeQuickHighVerified liveCreate a functional Hexo plugin for a relevant your tool capability, publish the package, then add its record to Hexo's official plugin data repository.Plugin must be genuinely useful, maintained and correctly packaged; submit the required YAML metadata through the documented contribution path, not a promotional-only entry.2026-08-05Open Hexo Plugin List submit page (new tab)Hexo Plugin List details
2786MeltanoHub50Link type unknownhub.meltano.comMarketplaces and app storesFreeQuickHighVerified liveBuild a Singer SDK tap that incrementally extracts your tool audit runs and findings, then add it through MeltanoHub's official issue-assisted or self-service contribution path.Must be an installable, maintained Singer tap with real schemas and incremental state behavior; do not submit a metadata-only package.2026-08-05Open MeltanoHub submit page (new tab)MeltanoHub details
2886Needle Directory—Link type unknownuseneedle.netStartup directoriesFreeQuickHighVerified liveSign in and submit an accurate your tool product profile for review.Verified startups and tools only; community upvotes must remain organic.2026-08-05Open Needle Directory submit page (new tab)Needle Directory details
2986Nimble Directory35Link type unknownnimble.directoryDeveloper registriesFreeQuickHighVerified liveRelease a maintained Nim client or utility for your tool and publish it through Nimble with accurate repository and homepage metadata.The package must meet Nimble manifest and source-hosting requirements and remain installable.2026-08-03Open Nimble Directory submit page (new tab)Nimble Directory details
3086Node-RED Flow Library65Link type unknownnodered.orgDeveloper registriesFreeQuickHighVerified liveCreate a functional your tool Node-RED node, publish it to npm, and add it to the Flow Library with documentation and support metadata.Must follow Node-RED naming, package metadata, node UX, testing, and documentation conventions and avoid thin wrappers.Official Node-RED custom node documentation checked 2026-08-07Open Node-RED Flow Library submit page (new tab)Node-RED Flow Library details
3186NuGet85Nofollownuget.orgDeveloper registriesFreeQuickHighVerified livePublish a real .NET library or CLI package with ProjectUrl, readme, repository and license metadata.Requires a Microsoft account and API key; packages undergo validation and indexing.Official Microsoft NuGet docs checked 2026-07-30Open NuGet submit page (new tab)NuGet details
3286NVDA Add-on Store60Link type unknownaddonstore.nvaccess.orgMarketplaces and app storesFreeQuickHighVerified liveBuild an installable privacy or accessibility NVDA add-on and submit it through the official add-on datastore workflow.Not a generic website listing; public source, documentation, compatible licensing, testing, and ongoing NVDA compatibility are required.Official live store and datastore submission guide checked 2026-08-05Open NVDA Add-on Store submit page (new tab)NVDA Add-on Store details
3386Obsidian Community Plugins75Link type unknownobsidian.mdMarketplaces and app storesFreeQuickHighVerified liveBuild a unique and useful Obsidian plugin, create valid releases and submit it to the community plugin directory.Requires a working plugin, release artifacts, documentation and compliance with Obsidian developer policies.Official Obsidian submission docs checked 2026-07-30Open Obsidian Community Plugins submit page (new tab)Obsidian Community Plugins details
3486Open Hub75Nofollowopenhub.netProfiles and entitiesFreeQuickHighVerified liveAdd or claim a genuine open-source your tool project and complete its description, code locations, tags and official homepage.FOSS projects only; connect real public source history and avoid duplicate or abandoned shell projects.Official live Open Hub project directory checked 2026-07-30Open Open Hub submit page (new tab)Open Hub details
3586OpenChain50Link type unknownopenchainproject.orgOther opportunitiesFreeQuickHighVerified liveImplement a scoped open-source compliance or security-assurance program, self-certify honestly, then request your tool Community of Conformance listing.Every applicable answer must truthfully be yes and scope must be explicit; self-certification is not independent certification or endorsement.2026-08-05 official conformance submission, FAQ and Community of Conformance pagesOpen OpenChain submit page (new tab)OpenChain details
3686OpenTelemetry Registry75Link type unknownopentelemetry.ioMarketplaces and app storesFreeQuickHighVerified liveAdd native OpenTelemetry support or build a useful your tool instrumentation or utility, then submit its registry metadata and documentation links.Must fit an allowed registry type, have real implementation and enablement docs, use accurate licence and marketing metadata, and stay maintained.2026-08-05 — https://opentelemetry.io/ecosystem/registry/adding/Open OpenTelemetry Registry submit page (new tab)OpenTelemetry Registry details
3786Package Control60Link type unknownpackagecontrol.ioMarketplaces and app storesFreeQuickHighVerified liveBuild a useful Sublime Text integration for an your tool developer workflow, document it publicly and submit the package for review.Requires a public repository, valid metadata, releases and successful automated tests; thin promotional plugins will not qualify.2026-08-03Open Package Control submit page (new tab)Package Control details
3886Pipedrive Marketplace85Link type unknownpipedrive.comMarketplaces and app storesFreeQuickHighVerified liveBuild a Pipedrive OAuth integration for safe note export, duplicate cleanup, or PII auditing and submit a unique your tool listing.OAuth and testing are mandatory; accept the partner agreement and provide working legal, support, and production URLs.Official Pipedrive app development and marketplace guidance checked 2026-08-07Open Pipedrive Marketplace submit page (new tab)Pipedrive Marketplace details
3986PlatformIO Registry60Link type unknownregistry.platformio.orgDeveloper registriesFreeQuickHighVerified livePackage a real embedded privacy or security library for supported boards, add complete PlatformIO manifest and examples, test it, and publish it publicly.Published name-version pairs are immutable; package must be functional, properly licensed, documented, versioned, and maintained.Official PlatformIO package-publish documentation checked 2026-08-05Open PlatformIO Registry submit page (new tab)PlatformIO Registry details
4086PowerShell Gallery75Nofollowpowershellgallery.comDeveloper registriesFreeQuickHighVerified livePublish a stable your tool module or script with ProjectURI, LicenseURI, tags, help and examples.Requires an account and API key; pass PowerShell Gallery validation and avoid placeholder packages.Official Microsoft publishing docs checked 2026-07-30Open PowerShell Gallery submit page (new tab)PowerShell Gallery details
4186pub.dev85Link type unknownpub.devDeveloper registriesFreeQuickHighVerified livePublish an your tool Dart package with homepage, repository, issue tracker, documentation and a complete readme.Must satisfy pub.dev policy and quality checks; a verified publisher is preferable for a branded package.Official Dart publishing docs checked 2026-07-30Open pub.dev submit page (new tab)pub.dev details
4286Pulsar Package Registry45Link type unknownpulsar-edit.devDeveloper registriesFreeQuickHighVerified liveBuild a maintained Pulsar editor package that performs a real your tool workflow, then publish it to the official package registry with a useful README and project link.Package must be hosted on GitHub and include valid package.json metadata, SemVer and Pulsar engine constraints; it must provide real editor functionality, not a backlink wrapper.2026-08-05Open Pulsar Package Registry submit page (new tab)Pulsar Package Registry details
4386RingCentral App Gallery85Link type unknownringcentral.comMarketplaces and app storesFreeQuickHighVerified liveBuild a public RingCentral integration around call-note privacy or safe file sharing and complete the profile with your tool documentation, privacy, and support links.A working public app is mandatory; screenshots must show the integration, and the profile needs installation, support, privacy, and legal details.Official RingCentral App Gallery promotion documentation checked 2026-08-07Open RingCentral App Gallery submit page (new tab)RingCentral App Gallery details
4486Sensu Bonsai50Link type unknownbonsai.sensu.ioOther opportunitiesFreeQuickHighVerified livePublish an open-source Sensu check/handler for your tool, create GitHub releases and bonsai.yml, then register it with description and tags.GitHub-hosted open-source asset; release archives, supported platforms, SHA-512 checksums, useful README and correct Bonsai metadata are required.2026-08-05 — https://docs.sensu.io/sensu-go/latest/plugins/assets/#share-an-asset-on-bonsaiOpen Sensu Bonsai submit page (new tab)Sensu Bonsai details
4586Speaker Deck85Nofollowspeakerdeck.comPublishing platformsFreeQuickHighVerified liveUpload an original conference-quality PDF deck explaining privacy-safe tooling or accessibility testing, with a useful description, correct category, references, and an honest profile link.Upload a real educational presentation, not a sales brochure. Free decks are public and downloadable; private or password-protected sharing requires Pro, and all content must be owned or licensed.2026-08-03Open Speaker Deck submit page (new tab)Speaker Deck details
4686StackStorm Exchange45Link type unknownexchange.stackstorm.orgOther opportunitiesFreeQuickHighVerified liveCreate a useful StackStorm integration or automation pack for an your tool workflow, then submit it through the official Exchange Incubator pull-request process.Pack must contain real actions, workflows, rules or sensors; pack.yaml metadata must pass naming, email, Python and SemVer checks, and contribution grants the documented copyright licence.2026-08-05Open StackStorm Exchange submit page (new tab)StackStorm Exchange details
4786Startup Grind70Link type unknownstartupgrind.comStartup directoriesFreeQuickHighVerified liveJoin a relevant chapter, complete the founder profile, attend suitable events, and share your tool only in genuine networking context.Choose a relevant chapter or event and follow organizer rules; member access is not a broadcast or mass-messaging channel.Official Startup Grind chapter community path checked 2026-08-07Open Startup Grind submit page (new tab)Startup Grind details
4886StartuPage—Link type unknownstartupa.geStartup directoriesFreeQuickHighVerified liveCreate an authentic founder profile, add your tool as a startup page and include verified website/social links.Use truthful traction data; do not fabricate revenue or create duplicate identities.2026-08-03Open StartuPage submit page (new tab)StartuPage details
4986Tableau Public90Nofollowpublic.tableau.comProfiles and entitiesFreeQuickHighVerified livePublish an original dashboard using public your tool benchmark or ecosystem data and add an appropriate project permalink in workbook details.Everything published is publicly accessible and may be downloadable; never include secrets, private analytics, user-level records, or confidential data.https://help.tableau.com/current/pro/desktop/en-gb/publish_workbooks_tableaupublic.htmOpen Tableau Public submit page (new tab)Tableau Public details
5086The Org65Nofollowtheorg.comStartup directoriesFreeQuickHighVerified liveAdd your tool’s real company, founder, and team structure with website and role details to create a trustworthy organization profile.Use verified work details and obtain team consent before publishing names or roles; do not fabricate an org chart.https://theorg.com/iterate/how-to-make-an-org-chartOpen The Org submit page (new tab)The Org details
5186Toolradar—Link type unknowntoolradar.comSoftware directoriesFreeQuickHighVerified liveCreate an your tool product page for discovery, comparison, and reviews.Vendor account and truthful product details required.https://toolradar.com/vendorsOpen Toolradar submit page (new tab)Toolradar details
5286Traefik Plugin Catalog60Link type unknownplugins.traefik.ioMarketplaces and app storesFreeQuickHighVerified liveBuild a production-quality Traefik middleware plugin for an your tool privacy or security use case and publish it to the public catalog.Plugin must be public, reusable, tested, documented, safely scoped, and compliant with Traefik plugin manifest and registry requirements.2026-08-05 — https://doc.traefik.io/traefik-hub/api-gateway/guides/plugin-development-guideOpen Traefik Plugin Catalog submit page (new tab)Traefik Plugin Catalog details
5386TYPO3 Extension Repository75Link type unknowntypo3.orgMarketplaces and app storesFreeQuickHighVerified liveBuild a TYPO3 backend extension for selected content or media PII, metadata, and accessibility checks.Register a unique extension key and provide public source, documentation, security policy, semantic versions, and maintained releases.Official TYPO3 Extension Repository publishing documentation checked 2026-08-07Open TYPO3 Extension Repository submit page (new tab)TYPO3 Extension Repository details
5486Umbraco Marketplace75Link type unknownumbraco.comMarketplaces and app storesFreeQuickHighVerified liveCreate an your tool Umbraco integration package and point its NuGet project URL plus documentation to your tool.The NuGet package needs the marketplace tag, supported Umbraco version metadata, documentation, and optional marketplace manifest.Official Umbraco Marketplace package listing documentation checked 2026-08-07Open Umbraco Marketplace submit page (new tab)Umbraco Marketplace details
5586UN SDG Actions Platform90Link type unknownsdgs.un.orgStartup directoriesFreeQuickHighVerified liveRegister a concrete ongoing your tool initiative with measurable milestones, dates, resources, SDG targets, partners and website evidence.Action must be specific, measurable, achievable, resource-based, time-bound and ongoing; not a proposal, completed activity or organization profile.2026-08-05 — https://sdgs.un.org/partnerships/acceleration-actions/registerOpen UN SDG Actions Platform submit page (new tab)UN SDG Actions Platform details
5686Upbound Marketplace45Link type unknownmarketplace.upbound.ioMarketplaces and app storesFreeQuickHighVerified liveBuild and publish a real Crossplane provider, function, configuration or add-on that integrates an your tool capability and exposes accurate project documentation.Use Upbound's package tooling and a public listing; package must be installable, maintained and useful to control-plane users. Confirm public visibility because new pushed packages may initially be private.2026-08-05Open Upbound Marketplace submit page (new tab)Upbound Marketplace details
5786Webex App Hub90Link type unknownwebex.comMarketplaces and app storesFreeQuickHighVerified liveBuild a production Webex integration or bot for deliberate sharing of your tool checklists or sanitized files, then submit its branded App Hub profile.Must be production-ready, use minimum scopes, avoid Cisco trademark misuse, and provide complete support and marketing material.Official Webex App Hub submission documentation checked 2026-08-07Open Webex App Hub submit page (new tab)Webex App Hub details
5886Wikimedia Toolhub95Link type unknowntoolhub.wikimedia.orgSoftware directoriesFreeQuickHighVerified liveBuild a tool that genuinely interacts with Wikimedia, publish accurate toolinfo.json metadata, and register it through Toolhub UI, crawler, or API.Must serve Wikimedia projects; Wikimedia login is required and submitted metadata is CC0; unrelated utilities do not qualify.Official Wikimedia developer search and Toolhub documentation checked 2026-08-05Open Wikimedia Toolhub submit page (new tab)Wikimedia Toolhub details
5986WorkflowHub45Link type unknownworkflowhub.euDeveloper registriesFreeQuickHighVerified livePackage a reproducible your tool privacy or redaction workflow, join or create a team, and register it with rich metadata and source links.Requires a real executable workflow file, team membership, accurate authorship/licence metadata, and a maintained public entry.2026-08-05 — https://about.workflowhub.eu/docs/registering_workflows/registering-a-workflow/Open WorkflowHub submit page (new tab)WorkflowHub details
6068BibSonomy65Nofollowbibsonomy.orgSocial channelsFreeQuickMediumVerified liveCurate a tagged public collection of authoritative privacy, accessibility, and safety resources with your tool included only where substantively relevant.Build a balanced useful bibliography; avoid repetitive self-bookmarking, keyword stuffing, or treating the service as a backlink directory.Official BibSonomy service and guidance checked 2026-08-07Open BibSonomy submit page (new tab)BibSonomy details
6168bio.tools55Link type unknownbio.toolsSoftware directoriesFreeQuickMediumVerified liveRegister a genuinely life-science-focused your tool resource with stable homepage, scientific operations, inputs, outputs, licence, and documentation.Must perform a credible bioinformatics or life-science function; medical branding alone is insufficient and EDAM metadata is expected.2026-08-05 — https://biotools.readthedocs.io/en/latest/quickstart_guide.htmlOpen bio.tools submit page (new tab)bio.tools details
6268Budibase Community Plugins60Link type unknownbudibase.comMarketplaces and app storesFreeQuickMediumVerified liveBuild a useful your tool Budibase component or data-source plugin, publish the package or repository, and seek inclusion in community plugin resources.A functional plugin and public package are required; central curation is not guaranteed, so treat the package and documentation as the primary asset.Official Budibase custom plugin documentation checked 2026-08-07Open Budibase Community Plugins submit page (new tab)Budibase Community Plugins details
6368CapRover One-Click Apps50Link type unknowncaprover.comSoftware directoriesFreeQuickMediumVerified liveCreate a tested CapRover one-click definition for a real self-hosted your tool service and contribute it to the linked official community repository.The directory is community-maintained; use safe defaults, document required variables and persistence, and keep images and deployment instructions current.Official CapRover one-click app documentation and repository checked 2026-08-05Open CapRover One-Click Apps submit page (new tab)CapRover One-Click Apps details
6468Chanakya Software—Link type unknownchanakyasoftware.comSoftware directoriesFreeQuickMediumVerified liveCreate a vendor account and list your tool software offering.Provide genuine vendor, website, software, and service details.https://www.chanakyasoftware.com/list-your-softwareOpen Chanakya Software submit page (new tab)Chanakya Software details
6568Clojars60Link type unknownclojars.orgDeveloper registriesFreeQuickMediumVerified liveRelease a genuine Clojure or JVM client library with a POM, description, homepage and source metadata.Requires an account and deploy credentials; use a unique group or verified domain and maintain releases.Official Clojars publishing interface checked 2026-07-30Open Clojars submit page (new tab)Clojars details
6668Common Workflow Language55Link type unknowncommonwl.orgSoftware directoriesFreeQuickMediumVerified liveBuild a genuine CWL validator, security tool, or implementation and propose its inclusion with compliance evidence.Must actually support CWL; the community-maintained listing does not constitute formal certification.Official CWL implementation page and website repository checked 2026-08-05Open Common Workflow Language submit page (new tab)Common Workflow Language details
6768Commudle40Link type unknowncommudle.comProfiles and entitiesFreeQuickMediumVerified liveCreate a real developer profile, publish an original your tool engineering tutorial or project, and join only relevant privacy or developer communities.Share knowledge first, follow each community's rules, and do not create an empty promotional community or mass-post the same link.Official Commudle community platform checked 2026-08-07Open Commudle submit page (new tab)Commudle details
6868Contao Extensions45Link type unknownextensions.contao.orgMarketplaces and app storesFreeQuickMediumVerified liveBuild a functional Contao bundle for an your tool site-audit use case, publish tagged releases on Packagist with contao-bundle and manager-plugin metadata, and let the official index discover it.Requires a real Contao extension, public Composer package, at least one version tag and correct Contao Manager Plugin metadata; optional rich listing metadata is contributed separately.2026-08-05Open Contao Extensions submit page (new tab)Contao Extensions details
6968CPAN / PAUSE80Link type unknowncpan.orgDeveloper registriesFreeQuickMediumVerified livePublish a genuine Perl module or CLI through PAUSE with project URLs and clear distribution documentation.Requires a PAUSE account, unique namespace and ongoing maintenance; first uploader controls the namespace.Official CPAN PAUSE docs checked 2026-07-30Open CPAN / PAUSE submit page (new tab)CPAN / PAUSE details
7068CreativesFeed40Link type unknowncreativesfeed.comSoftware directoriesFreeQuickMediumVerified liveSubmit relevant your tool utilities under AI, web, or developer categories.Only submit tools matching available creative, AI, or development categories.https://creativesfeed.com/contact/submit-your-software/free-software-listing/Open CreativesFeed submit page (new tab)CreativesFeed details
7168devChallenges50Link type unknowndevchallenges.ioDesign galleriesFreeQuickMediumVerified liveBuild a genuine free challenge solution, publish the deployed project and repository, and use the finished privacy or accessibility implementation as a portfolio case study.Only submit work that answers a listed challenge; do not upload AltFTool as an unrelated product, and remember solutions remain public.Official devChallenges platform and plan information checked 2026-08-07Open devChallenges submit page (new tab)devChallenges details
7268Devpost85Nofollowdevpost.comDesign galleriesFreeQuickMediumVerified liveEnter a relevant live hackathon with a working your tool project, complete its story and demo, and include the project website where allowed.Only submit to genuinely relevant events, follow each hackathon's eligibility and judging rules, and do not recycle an unrelated promotion.Official Devpost submission help checked 2026-07-30Open Devpost submit page (new tab)Devpost details
7368ESP Component Registry65Link type unknowncomponents.espressif.comDeveloper registriesFreeQuickMediumVerified liveBuild an ESP-IDF privacy, credential-safety, secure-logging, or local-processing component, add manifest, license, docs, examples, and publish it through the registry workflow.Must be an actual ESP-IDF component; namespace, semantic versioning, linting, licensing, dependency, documentation, and upload rules apply.Official ESP Component Registry publishing documentation checked 2026-08-05Open ESP Component Registry submit page (new tab)ESP Component Registry details
7468F-Droid75Link type unknownf-droid.orgSoftware directoriesFreeQuickMediumVerified livePublish a privacy-respecting open-source Android companion app, then file a packaging request or merge request.App must be source-buildable, useful and actively maintained, with no proprietary tracking, ads or non-free dependencies.Official F-Droid inclusion policy checked 2026-07-30Open F-Droid submit page (new tab)F-Droid details
7568Fluentd Plugin Directory65Link type unknownfluentd.orgMarketplaces and app storesFreeQuickMediumVerified liveBuild and publish a real fluent-plugin-* RubyGem that redacts/routes privacy-sensitive logs and includes your tool as its project homepage.Must follow Fluentd plugin naming/API conventions and be a valid public RubyGem; the official directory refreshes periodically from RubyGems, so indexing is not immediate.2026-08-05 — https://docs.fluentd.org/plugin-developmentOpen Fluentd Plugin Directory submit page (new tab)Fluentd Plugin Directory details
7668getfolio.dev—Link type unknowngetfolio.devDeveloper registriesFreeQuickMediumVerified liveCreate a founder/developer portfolio, pin your tool repository/project and add the official website link.Use a real GitHub identity and maintained projects; avoid a profile created only for SEO.2026-08-03Open getfolio.dev submit page (new tab)getfolio.dev details
7768Goodreads90Nofollowgoodreads.comProfiles and entitiesFreeQuickMediumVerified liveCreate a truthful your tool/founder profile or content page and add the website link where allowed.Use a real brand/founder identity; do not create thin duplicate pages. Listing link is currently reported nofollow.2026-07-30 • https://www.submission.directory/site/goodreadsOpen Goodreads submit page (new tab)Goodreads details
7868Hackage75Link type unknownhackage.haskell.orgDeveloper registriesFreeQuickMediumVerified liveRelease a useful Haskell library or command-line client with homepage, source and bug-report metadata.Hackage requires open-source, meaningful packages; uploaded versions cannot simply be replaced.Official Hackage upload page checked 2026-07-30Open Hackage submit page (new tab)Hackage details
7968HubPages85Nofollowhubpages.comProfiles and entitiesFreeQuickMediumVerified liveCreate a truthful your tool/founder profile or content page and add the website link where allowed.Use a real brand/founder identity; do not create thin duplicate pages. Listing link is currently reported nofollow.2026-07-30 • https://www.submission.directory/site/hubpagesOpen HubPages submit page (new tab)HubPages details
8068HundrED60Link type unknownhundred.orgProfiles and entitiesFreeQuickMediumVerified liveApply with a privacy/digital-safety education program that demonstrates real K-12 impact and scalability.Current Global Collection 2028 call closes 2027-05-01; normally implemented for 1+ year and reached 1,000+ children; evidence required.2026-08-05 — https://hundred.org/en/collections/hundred-global-collection-2028Open HundrED submit page (new tab)HundrED details
8168Jellyfin Plugin Catalog70Link type unknownjellyfin.orgMarketplaces and app storesFreeQuickMediumVerified liveBuild a functional Jellyfin privacy, metadata-cleanup, or local-safety plugin with a maintained manifest repository, then propose its repository and documentation entry.Third-party listing is curated through documentation; official inclusion is not guaranteed and the plugin must remain compatible with Jellyfin's ABI.Official Jellyfin plugin catalog and repository guidance checked 2026-08-05Open Jellyfin Plugin Catalog submit page (new tab)Jellyfin Plugin Catalog details
8268Knowledge Commons / CORE70Nofollowhcommons.orgDeveloper registriesFreeQuickMediumVerified liveCreate a truthful scholarly profile and deposit an original privacy, accessibility, or digital-humanities paper or teaching resource with its related your tool URL.Work must genuinely serve scholarship or pedagogy; upload only rights-cleared material, not sales copy.2026-08-05 — https://registry.hcommons.org/registry/co_petitions/start/coef%3A158Open Knowledge Commons / CORE submit page (new tab)Knowledge Commons / CORE details
8368LineZine20Link type unknownlinezine.comSoftware directoriesFreeQuickMediumVerified liveChoose the free listing or purchase a dedicated your tool product page.Free clicks are redirected/nofollow; paid option provides a dedicated dofollow page.https://linezine.com/list-your-toolOpen LineZine submit page (new tab)LineZine details
8468LuaRocks55Link type unknownluarocks.orgDeveloper registriesFreeQuickMediumVerified liveCreate a useful Lua client or helper, publish its rockspec and include homepage, license and source links.Only publish a working Lua module with correct dependencies and versioned source archives.Official LuaRocks page checked 2026-07-30Open LuaRocks submit page (new tab)LuaRocks details
8568Mastra Templates and Integrations50Link type unknownmastra.aiMarketplaces and app storesFreeQuickMediumVerified liveCreate a working public your tool integration or reusable Mastra template with repository and documentation for review and cross-listing.A working integration and public repository are required; documentation listing, partner placement, and co-marketing are not guaranteed.2026-08-05Open Mastra Templates and Integrations submit page (new tab)Mastra Templates and Integrations details
8668napari Hub40Link type unknownnapari-hub.orgMarketplaces and app storesFreeQuickMediumVerified liveCreate a useful npe2 napari plugin for image privacy, metadata inspection or scientific redaction, publish it correctly on PyPI and let the official hub index its project metadata.Must be a working napari plugin with correct manifest, classifiers, tests and PyPI metadata; directory pages expose project details but are not an endorsement.2026-08-05Open napari Hub submit page (new tab)napari Hub details
8768Participedia50Link type unknownparticipedia.netOther opportunitiesFreeQuickMediumVerified liveDocument a real participatory public-decision deployment as a Case, Method or Organization entry with evaluations and project URL.Community knowledge base, not a product directory; cite credible sources and show genuine participation outcomes.2026-08-05 — https://participedia.net/getting-startedOpen Participedia submit page (new tab)Participedia details
8868pckt—Link type unknownpckt.blogPublishing platformsFreeQuickMediumVerified liveCreate a genuine your tool publication and post substantial product research, tutorials or engineering notes.Sign-in is required; publish original long-form work rather than a link-only profile.2026-08-04Open pckt submit page (new tab)pckt details
8968ProcessWire Modules Directory65Link type unknownprocesswire.comOther opportunitiesFreeQuickMediumVerified liveBuild a ProcessWire admin module for external URL, metadata, accessibility or security audits, register as a module author and submit it to the official directory.Author login required; avoid duplicating existing SEO modules and provide a specific external-audit workflow with maintained source, documentation and support.2026-08-05Open ProcessWire Modules Directory submit page (new tab)ProcessWire Modules Directory details
9068RabbitMQ Community Plugins80Link type unknownrabbitmq.comMarketplaces and app storesFreeQuickMediumVerified liveBuild a stable open-source RabbitMQ plugin for a legitimate your tool security/privacy workflow and ask the RabbitMQ team to list it.Must be a real Erlang/OTP plugin, safely supervised, tested against supported RabbitMQ releases, distributed as an .ez artifact and maintained by its author.2026-08-05 — https://www.rabbitmq.com/plugin-developmentOpen RabbitMQ Community Plugins submit page (new tab)RabbitMQ Community Plugins details
9168Research Software Directory35Link type unknownresearch-software-directory.orgSoftware directoriesFreeQuickMediumVerified liveRequest access, then publish a rich your tool research-software page with source, getting-started URL, DOI, contributors, and research mentions.Only for genuine research software with evidence and public source or releases; truthful affiliation and ORCID information are required.2026-08-05 — https://research-software-directory.org/documentation/users/adding-software/Open Research Software Directory submit page (new tab)Research Software Directory details
9268Roadie Backstage Plugins Directory50Link type unknownroadie.ioMarketplaces and app storesFreeQuickMediumVerified livePublish a substantial open-source Backstage plugin that integrates your tool privacy/security checks, then request inclusion if the directory does not discover it.Plugin must be installable, documented and maintained; public directory inclusion is curated/indexed and not guaranteed merely by publishing an npm package.2026-08-05 — https://roadie.io/docs/details/requesting-plugins/Open Roadie Backstage Plugins Directory submit page (new tab)Roadie Backstage Plugins Directory details
9368SciCrunch RRID Resource Portal60Link type unknownscicrunch.orgOther opportunitiesFreeQuickMediumVerified liveRegister a stable, genuinely research-used your tool software, service, or database with accurate maintainer and version metadata.Must be a persistent research resource; acceptance or identifier assignment is curated and not intended for promotional listings.2026-08-05 — https://scicrunch.org/resources/about/resource?form=Resource&rel=26Open SciCrunch RRID Resource Portal submit page (new tab)SciCrunch RRID Resource Portal details
9468Silverstripe Add-ons60Link type unknownaddons.silverstripe.orgMarketplaces and app storesFreeQuickMediumVerified liveBuild a maintained Silverstripe CMS module for a useful your tool privacy, accessibility or URL-audit workflow, publish it with correct Composer metadata and submit it to the public directory.Module must be open and installable, follow Silverstripe conventions, document usage and compatibility, use tagged releases and accept ongoing code-quality and update responsibility.2026-08-05Open Silverstripe Add-ons submit page (new tab)Silverstripe Add-ons details
9568Sketchfab90Nofollowsketchfab.comProfiles and entitiesFreeQuickMediumVerified livePublish an original educational 3D asset connected to a real your tool tutorial, with accurate credits and a contextual project link in the description.Upload only content you own or can license; descriptions should explain the model rather than serve as link ads, and UGC links may be nofollow.2026-08-03Open Sketchfab submit page (new tab)Sketchfab details
9668Tolodora—Link type unknowntolodora.comSoftware directoriesFreeQuickMediumVerified liveAdd your tool as a SaaS or online service with its official URL.Use accurate categories and avoid duplicate or promotional spam entries.https://tolodora.com/Open Tolodora submit page (new tab)Tolodora details
9768Ulauncher Extensions40Link type unknownulauncher.ioLaunch platformsFreeQuickMediumVerified liveBuild a Python keyword extension that runs useful your tool URL, domain or metadata checks and displays concise results, then submit its public repository through the official form.Requires GitHub authentication and the current Ulauncher extension API; secure credentials and return useful in-launcher output instead of merely opening a marketing page.2026-08-05Open Ulauncher Extensions submit page (new tab)Ulauncher Extensions details
9868Venture by MyVenture—Link type unknownmyventure.devStartup directoriesFreeQuickMediumVerified liveCreate a founder profile, add your tool as a startup and share authentic milestones or metrics.Only share truthful metrics; keep the profile updated instead of using it as a one-link shell.2026-08-03Open Venture by MyVenture submit page (new tab)Venture by MyVenture details
9968Vim Online Scripts75Link type unknownvim.orgMarketplaces and app storesFreeQuickMediumVerified liveBuild and upload a genuinely useful Vim privacy or secret-checking plugin with your tool documentation and a relevant project link.Only publish a working original script; follow Vim script upload rules and avoid keyword-stuffed descriptions.2026-08-05Open Vim Online Scripts submit page (new tab)Vim Online Scripts details
10068WebThings Add-ons45Link type unknownwebthings.ioMarketplaces and app storesFreeQuickMediumVerified liveBuild a WebThings adapter, notifier, or interface extension for local privacy or device-risk controls, follow the add-on APIs, test on Gateway 2.x, and publish it to the directory.Must be an actual WebThings add-on, use unique non-misleading branding, document device/data access, and account for current 2.x compatibility.Official WebThings add-on directory and development guidance checked 2026-08-05Open WebThings Add-ons submit page (new tab)WebThings Add-ons details

How to build backlinks with this list

Four steps that work for a new site, a SaaS or a side project. No paid link packages, nothing that risks a penalty.

  1. Get the basics right first

    Before submitting anywhere, have a one-line description, a 150-word description, a square logo and two or three screenshots ready. Every form asks for some mix of these.

  2. Claim profiles and free listings

    Start with the free, quick rows: profile creation sites and free directories. They are one form each and build the entity signals search engines use to understand who you are.

  3. Go after a few strong links

    Then pick a handful of high DA and dofollow sites that fit your niche, and write proper guest posts or launch posts for them. Ten relevant links beat a hundred random ones.

  4. Track and keep it clean

    Note where you submitted and when. Recheck after a month, update stale descriptions, and never pay for bulk link packages: they put the whole site at risk.

Behind the list

A link opportunity is not a link.

Every row here starts as a line in a sheet, gets normalised into one of 16 groups, scored for cost, effort and impact, and written up with the steps to actually submit. The floor below represents that pipeline.

Open the sheet view

An illustration of the AltF Backlinks floor: opportunities sourced at the back, vetted for cost and effort by the engineering pod, written up for outreach by the design pod, then tracked to placement along a line.

Backlink sites by category

Common questions

Do backlinks still matter for ranking in 2026?
Links remain one signal among many, and low-quality bulk links do more harm than good. What still works is being listed where your buyers actually look — directories with real traffic, registries your peers use, and launch platforms with engaged audiences. Every entry in this list is a place a human might plausibly find you, which is why they are worth submitting to regardless of link equity.
Which submissions should I do first?
Start with the quick wins filter: free, low effort, and not in the lowest priority band. 208 of the 1,964 entries qualify, and those are the ones where a single form submission gets you a live listing the same week. Launch platforms are worth saving until your product is genuinely ready, because you only get one good attempt at each.
How is the impact score calculated?
It starts from a hand-assigned priority band (do first, high, medium, later), then adjusts for cost and effort. A free, quick opportunity scores above a paid, involved one in the same band, because it is the one you can realistically finish today. The score is a queueing aid, not a measure of domain authority.
Are these links free?
1,628 of the 1,964 entries are free to submit to or offer a free tier that includes a listing. Cost is shown on every row, and the "nothing to pay" filter narrows the list to exactly those.
Which backlink sites are dofollow?
44 entries are known to give a followed link on a normal listing, and more give one only in some placements. The link type is shown on every row and can be filtered. Sites change their link policy without notice, so treat the label as a starting point and check the live page after you are listed. A nofollow link from a busy site still sends visitors and helps search engines discover you.
What does the DA number mean?
It is our estimate of the site's domain authority, a third-party style 0-100 score of how strong a domain's link profile is, rounded to the nearest 5. 1,580 of the 1,964 sites have one. It is useful for comparing sites, not a Google metric, so relevance to your niche still matters more.
How do I get backlinks for a new website?
1. Get the basics right first: Before submitting anywhere, have a one-line description, a 150-word description, a square logo and two or three screenshots ready. Every form asks for some mix of these. 2. Claim profiles and free listings: Start with the free, quick rows: profile creation sites and free directories. They are one form each and build the entity signals search engines use to understand who you are. 3. Go after a few strong links: Then pick a handful of high DA and dofollow sites that fit your niche, and write proper guest posts or launch posts for them. Ten relevant links beat a hundred random ones. 4. Track and keep it clean: Note where you submitted and when. Recheck after a month, update stale descriptions, and never pay for bulk link packages: they put the whole site at risk.
Will submitting everywhere hurt my site?
Submitting to spam directories can. That is why this list is curated rather than scraped, and why entries carry a status showing whether they have been verified as live. Skip anything that promises hundreds of links for a fee, and prefer places where a real person reviews submissions.