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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
1100Glama MCP Directory50Link type unknownglama.aiOther opportunitiesFreeQuickDo firstNot submittedDeploy a maintained your tool MCP server from GitHub, Docker, npm, or PyPI, verify maintainer ownership, and switch it public only after production testing.Hosted servers are private by default; public listing requires a real working server, and ranking or backlink attributes remain platform-controlled.2026-08-03Open Glama MCP Directory submit page (new tab)Glama MCP Directory details
2100MERLOT70Link 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
398Genially80Nofollowgenially.comOther opportunitiesFreeModerateDo firstVerified liveCreate an original interactive your tool privacy or accessibility guide and add relevant external actions to cited live tools.Public work must be original and useful; community submissions become reusable, and student seats cannot publish publicly.2026-08-04Open Genially submit page (new tab)Genially details
498Open Source Technology Improvement Fund45Link type unknownostif.orgOther opportunitiesFreeModerateDo firstLive, conditionalRequest an audit for a mature open-source your tool security component, providing maintainer contacts, architecture, threat model, scope, tests, and a remediation commitment.Intended for real open-source projects able to collaborate throughout scoping, audit, fixes, disclosure, and publication of the final report; selection and funding are not guaranteed.2026-08-03Open Open Source Technology Improvement Fund submit page (new tab)Open Source Technology Improvement Fund details
598Spreaker85Nofollowspreaker.comOther opportunitiesFreeModerateDo firstLive, conditionalCreate or import a genuine your tool show, keep it public, set its official Website field and publish useful episodes.Correct ownership and original/licensed audio are required; no promotional shell podcast.2026-08-04Open Spreaker submit page (new tab)Spreaker details
695Educative75Sometimes dofolloweducative.ioOther opportunitiesFreeInvolvedDo firstVerified livePropose a text-based, interactive course on web privacy, security headers, local-first tools, or accessible frontend testing, with practical code exercises and clear outcomes.Applicants need real subject expertise and clear teaching ability. The outline, lessons, code, and claims receive Author Success, technical, and editorial review; the course must teach independently of AltFTool promotion.2026-08-03Open Educative submit page (new tab)Educative details
786Apache 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
886APIList.fun45Link type unknownapilist.funOther opportunitiesFreeQuickHighLive, conditionalRecommend an official your tool API with its documentation URL, concise Markdown description, category, and technical details.Submit only an active public API with accurate auth, SSL, request, and response information.2026-08-05Open APIList.fun submit page (new tab)APIList.fun details
986APIs.guru OpenAPI Directory50Link type unknownapis.guruOther opportunitiesFreeQuickHighLive, conditionalWhen your tool exposes a stable public API, host an official OpenAPI definition at a permanent URL and submit it with accurate ownership, category, logo, and metadata.The API must be public through clearly documented access steps, persistent, independently useful, and described by a valid machine-readable definition. APIs.guru aggregates rather than hosts the specification and automatically rechecks its source, so keep the canonical spec stable and current.2026-08-03Open APIs.guru OpenAPI Directory submit page (new tab)APIs.guru OpenAPI Directory details
1086FOSSRadar—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
1186Fourthwall70Nofollowfourthwall.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
1286Global 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
1386Goodpods60Nofollowgoodpods.comOther opportunitiesFreeQuickHighLive, conditionalSearch for and claim a real your tool podcast, then keep its RSS-supplied website and episode metadata accurate.Claim only a show AltFTool owns; authentic podcast content and RSS ownership are required.2026-08-04Open Goodpods submit page (new tab)Goodpods details
1486HSTS Preload List70Link type unknownhstspreload.orgOther opportunitiesFreeQuickHighNot submittedAudit every your tool subdomain, stage HSTS safely, then submit the base domain only after long-term HTTPS readiness is proven.Requires a valid certificate, HTTP-to-HTTPS redirect, HTTPS on every subdomain, and HSTS max-age of at least one year with includeSubDomains and preload. Inclusion is difficult and slow to undo, so do not submit before a staged rollout.2026-08-03Open HSTS Preload List submit page (new tab)HSTS Preload List details
1586Listen Notes80Dofollowlistennotes.comOther opportunitiesFreeQuickHighLive, conditionalSubmit a real your tool podcast RSS feed whose show website and episode notes naturally reference relevant tools.Valid human-made podcast with substantive episodes only; low-quality or link-only feeds are rejected.2026-08-04Open Listen Notes submit page (new tab)Listen Notes details
1686OpenChain50Link 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
1786Player FM80Nofollowplayer.fmOther opportunitiesFreeQuickHighLive, conditionalSubmit a genuine your tool podcast RSS feed or Apple Podcasts URL with accurate show-website and episode metadata.Feed must be public, accessible and contain playable audio enclosures; do not submit a fake link-only feed.2026-08-04Open Player FM submit page (new tab)Player FM details
1886Pocket Casts70Link type unknownpocketcasts.comOther opportunitiesFreeQuickHighLive, conditionalSubmit a real public your tool podcast RSS feed whose metadata and episode notes reference the official site naturally.Requires a valid public RSS feed and genuine episodes; do not submit a shell or private feed as public.2026-08-05Open Pocket Casts submit page (new tab)Pocket Casts details
1986PulseMCP45Link type unknownpulsemcp.comOther opportunitiesFreeQuickHighLive, conditionalSubmit your tool MCP repository or public server URL, preferably after publishing it to the official MCP Registry.Registry data is processed periodically; only submit a real repository, server or client.2026-08-04Open PulseMCP submit page (new tab)PulseMCP details
2086PWA Directory35Link type unknownpwa.directoryOther opportunitiesFreeQuickHighLive, conditionalFirst pass PWA checks, then submit the installable HTTPS app with manifest, service worker, offline behavior, icons, and screenshots.Requires a valid manifest, registered service worker, useful offline behavior, HTTPS, no broken links, and more than a bare website wrapper.2026-08-03Open PWA Directory submit page (new tab)PWA Directory details
2186Sensu 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
2286StackStorm 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
2384Amazon Music for Podcasters95Nofollowpodcasters.amazon.comOther opportunitiesFreeModerateHighLive, conditionalSubmit and verify one genuine your tool podcast feed for distribution on Amazon Music and Audible.RSS must expose a valid owner email; rights, license, and platform rules apply, and review may take up to one week.2026-08-05Open Amazon Music for Podcasters submit page (new tab)Amazon Music for Podcasters details
2484Bitrise Step Library70Link type unknownbitrise.ioOther opportunitiesFreeModerateHighVerified liveBuild a Bitrise Step that runs your tool secret, privacy, or accessibility checks on explicitly chosen build artifacts.Provide step.yml, implementation, README, declared inputs and outputs, dependencies, and tests; pass Step Library review.Official Bitrise custom Step development documentation checked 2026-08-07Open Bitrise Step Library submit page (new tab)Bitrise Step Library details
2584Castbox75Nofollowcastbox.fmOther opportunitiesFreeModerateHighLive, conditionalAdd or claim a real your tool podcast in Creator Studio and complete channel, site and episode metadata.Must own the show and verify access to its RSS email; publish original audio content.2026-08-04Open Castbox submit page (new tab)Castbox details
2684CrowdSec Hub50Link type unknownapp.crowdsec.netOther opportunitiesFreeModerateHighVerified liveCreate a defensive parser, scenario, or collection for a real your tool-supported log source, document and test it, then submit it to CrowdSec Hub.Must use valid labels, tests, fixtures, documentation, and safe detection logic; CI and maintainer review apply.Official CrowdSec Hub contribution guide checked 2026-08-05Open CrowdSec Hub submit page (new tab)CrowdSec Hub details
2784Daggerverse60Link type unknowndagger.ioOther opportunitiesFreeModerateHighVerified liveCreate a TypeScript or Go module that runs your tool web audits in CI and returns machine-readable JSON/SARIF with useful pass/fail thresholds, then publish it to Daggerverse.Use valid semantic version tags, clear descriptions, tests and hand-written examples; Daggerverse indexes source rather than hosting it, so the module must provide real CI value.2026-08-05Open Daggerverse submit page (new tab)Daggerverse details
2884Indie Makers Hub—Link type unknownindiemakershub.comOther opportunitiesFreeModerateHighVerified liveSubmit your tool through the official reviewed product form.Google authentication may be required; complete and relevant submissions only.2026-08-05Open Indie Makers Hub submit page (new tab)Indie Makers Hub details
2984Internet.nl Hall of Fame60Link type unknowninternet.nlOther opportunitiesFreeModerateHighNot submittedRun the website and email tests, fix IPv6, DNSSEC, HTTPS, security headers, DMARC/DKIM/SPF, STARTTLS/DANE, and RPKI gaps, then retain a 100% score.The domain is listed only when it scores 100% in the relevant test; the badge may be used only for the matching domain and only while the score remains 100%.2026-08-03Open Internet.nl Hall of Fame submit page (new tab)Internet.nl Hall of Fame details
3084JS.ORG70Dofollowjs.orgOther opportunitiesFreeModerateHighVerified liveCreate a genuine JavaScript SDK or demo on GitHub Pages and request an appropriate js.org subdomain that links to its official your tool documentation.The project must be JavaScript-related and useful; spam, phishing and dubious content are prohibited, and a pull-request review is required.2026-08-03Open JS.ORG submit page (new tab)JS.ORG details
3184Langflow Component Bundles50Link type unknownlangflow.orgOther opportunitiesFreeModerateHighVerified liveContribute an your tool provider bundle with useful privacy or security components and provider documentation links.Requires production-quality backend components, frontend assets, tests and a reviewed Langflow pull request; generic promotion is rejected.2026-08-05Open Langflow Component Bundles submit page (new tab)Langflow Component Bundles details
3284LinuxLinks60Dofollowlinuxlinks.comOther opportunitiesFreeModerateHighLive, conditionalSubmit a maintained your tool desktop or CLI utility only after it runs natively on a modern Linux distribution and has a public OSI-approved license and repository.The program must be open source, current, searchable as not already covered, buildable on modern Linux, and accompanied by its repository, license, website, and factual feature summary.2026-08-03Open LinuxLinks submit page (new tab)LinuxLinks details
3384Maven70Link type unknownmaven.comOther opportunitiesFreeModerateHighVerified liveBuild and teach a live, project-based cohort on creating local-first privacy tools or accessible web utilities, supported by a substantive public syllabus and real instructor profile.The official accelerator targets professional development for mid-career business or tech learners and requires a Stripe Connect-supported country. Marketplace discovery follows traction; the instructor must deliver the promised live teaching and projects.2026-08-03Open Maven submit page (new tab)Maven details
3484Mixcloud90Nofollowmixcloud.comOther opportunitiesFreeModerateHighLive, conditionalUpload an original your tool audio explainer and place relevant resource links naturally in the show description.Owned or licensed genuine audio only; no synthetic link-only upload, and basic-tier limits apply.2026-08-04Open Mixcloud submit page (new tab)Mixcloud details
3584MoodleNet65Link type unknownmoodle.netOther opportunitiesFreeModerateHighVerified liveShare an openly licensed your tool digital-safety lesson pack or Moodle activity and curate it into an educator-focused collection.Authentication and publication approval apply; content must be genuine OER with accurate licensing, not a promotional link drop.2026-08-05 — https://moodle.com/news/moodlenet-share-curate-open-educational-resources/Open MoodleNet submit page (new tab)MoodleNet details
3684New Relic Instant Observability90Link type unknownnewrelic.comOther opportunitiesFreeModerateHighLive, conditionalCreate a useful quickstart for monitoring a real your tool deployment, with instrumentation instructions, a working data source, dashboards, alerts, documentation, and a GitHub contribution.Telemetry must actually reach New Relic and the quickstart must help users monitor a real use case. Follow catalog schema, asset, testing, GitHub review, and maintenance requirements; do not submit a brand-only listing.2026-08-03Open New Relic Instant Observability submit page (new tab)New Relic Instant Observability details
3784ODI Open Data Certificates55Link type unknowncertificates.theodi.orgOther opportunitiesFreeModerateHighVerified livePublish a machine-readable privacy, accessibility, or scam-pattern dataset or API and complete its evidence-based public certificate.Applies to an actual open dataset, not the product alone; it must be accessible, licensed, documented, maintained, and accurately described.2026-08-05 — https://certificates.theodi.org/Open ODI Open Data Certificates submit page (new tab)ODI Open Data Certificates details
3884OPA Ecosystem60Link type unknownopenpolicyagent.orgOther opportunitiesFreeModerateHighVerified liveBuild a functional OPA/Rego privacy-policy integration or developer tool, document it, then add its ecosystem entry and logo through the official docs repository.Must be a real OPA-related project or integration; create the required ecosystem markdown and icon, keep claims factual, and pass review.Official OPA contributing and ecosystem-listing instructions checked 2026-08-05Open OPA Ecosystem submit page (new tab)OPA Ecosystem details
3984Open Textbook Library85Link type unknownopen.umn.eduOther opportunitiesFreeModerateHighVerified liveSubmit a complete, openly licensed privacy/digital-safety textbook already used in higher education.Complete semester-length text; no CC-ND; must be used at multiple higher-ed institutions or backed by a higher-ed, scholarly or professional body.2026-08-05 — https://open.umn.edu/opentextbooks/textbooks/submitOpen Open Textbook Library submit page (new tab)Open Textbook Library details
4084OpenLearn Create90Link type unknownopen.eduOther opportunitiesFreeModerateHighVerified livePublish a free mini-course on privacy, redaction, scam detection, or accessibility with genuine your tool exercises in the curriculum.Publication is checked; clear all rights, meet accessibility requirements, use appropriate licensing, and avoid direct marketing.2026-08-05 — https://www.open.edu/openlearncreate/local/ocwcreatecourse/gettingstarted.phpOpen OpenLearn Create submit page (new tab)OpenLearn Create details
4184Payhip75Link type unknownpayhip.comOther opportunitiesFreeModerateHighVerified livePublish a genuinely useful free privacy checklist, redaction template, or safety workbook that complements your tool and has standalone value.The resource must be substantive and rights-cleared; disclose AltFTool links and avoid a one-page promotional download.Official Payhip pricing and publishing path checked 2026-08-07Open Payhip submit page (new tab)Payhip details
4284Podcast Addict70Link type unknownpodcastaddict.comOther opportunitiesFreeModerateHighLive, conditionalSubmit a valid public your tool podcast feed and keep website and episode-link metadata accurate.Feed must contain playable genuine episodes; directory review may take time.2026-08-04Open Podcast Addict submit page (new tab)Podcast Addict details
4384REUSE API50Link type unknownreuse.softwareOther opportunitiesFreeModerateHighLive, conditionalMake a real public your tool repository REUSE-compliant, register its Git URL, and link the resulting compliance page from project docs.Public maintained repository only; main branch is checked and email confirmation is required; fix findings rather than using a decorative badge.2026-08-05 official REUSE API and register pagesOpen REUSE API submit page (new tab)REUSE API details
4484Scalar50Link type unknownscalar.usc.eduOther opportunitiesFreeModerateHighVerified livePublish a coherent multimedia field guide on privacy, scam evidence, or accessible documents with cited your tool demonstrations.Create a real scholarly or educational book, make it public, and use only owned or properly licensed media.2026-08-05 — https://scalar.usc.edu/works/guide2/creating-an-accountOpen Scalar submit page (new tab)Scalar details
4584Snakemake Workflow Catalog50Link type unknownsnakemake.github.ioOther opportunitiesFreeModerateHighVerified livePublish a public reproducible privacy-safe research workflow with a Snakefile, README, configuration, catalog metadata, and tests.Public GitHub repository and Snakemake workflow structure are required; standardized layout strengthens catalog integration.Official Snakemake Workflow Catalog guide checked 2026-08-05Open Snakemake Workflow Catalog submit page (new tab)Snakemake Workflow Catalog details
4684Spotify for Creators95Nofollowcreators.spotify.comOther opportunitiesFreeModerateHighLive, conditionalHost or claim a genuine your tool show, verify the RSS email, and publish accurate episode notes with relevant HTTPS resources.Ownership verification is required; links must support real episode content and display behavior varies by app.2026-08-05Open Spotify for Creators submit page (new tab)Spotify for Creators details
4784StackBlitz85Nofollowstackblitz.comOther opportunitiesFreeModerateHighVerified livePublish a working browser demo or starter that teaches an your tool integration, with accurate title, description and canonical documentation link.Make the project genuinely reusable and public; links may be treated as user-generated and SEO value is not guaranteed.2026-08-03Open StackBlitz submit page (new tab)StackBlitz details
4884Swagger Studio75Nofollowapp.swaggerhub.comOther opportunitiesFreeModerateHighLive, conditionalPublish a real your tool OpenAPI definition publicly with an accurate description and external documentation URL.API must be genuine and the spec valid; set visibility to public and publication status accurately, with no credentials in examples.https://support.smartbear.com/swagger/studio/docs/en/manage-apis/publish-an-api.htmlOpen Swagger Studio submit page (new tab)Swagger Studio details
4984Wikiversity85Nofollowen.wikiversity.orgOther opportunitiesFreeModerateHighVerified liveDevelop a neutral, sourced learning project about privacy, accessibility, or online-scam literacy and cite your tool only in relevant exercises.Content must be freely licensed, verifiable, collaborative, and non-promotional; external links must directly serve learning.2026-08-05 — https://en.wikiversity.org/wiki/Creating_Wikiversity_CoursesOpen Wikiversity submit page (new tab)Wikiversity details
5084Working Not Working50Link type unknownworkingnotworking.comOther opportunitiesFreeModerateHighVerified liveBuild a genuine founder or designer profile and publish a detailed your tool UX, accessibility, or privacy-design case study with accurate role and process credits.Use a real individual creative identity, not a company backlink shell; upload original work, credit collaborators, and explain the project.Official Working Not Working member profile guidance checked 2026-08-07Open Working Not Working submit page (new tab)Working Not Working details
5184YunoHost Apps55Link type unknownapps.yunohost.orgOther opportunitiesFreeModerateHighVerified livePackage a free-software self-hosted your tool deployment, implement reliable install, upgrade, backup and restore operations, then submit it to the official app catalog.Only freely licensed software is accepted; app-quality tests, packaging conventions, security, resource use and long-term maintenance must meet YunoHost review.2026-08-05Open YunoHost Apps submit page (new tab)YunoHost Apps details
5281AI Verify Foundation35Link type unknownaiverifyfoundation.sgOther opportunitiesFreeInvolvedHighLive, conditionalRun AI Verify on a real your tool AI use case, then submit accurate results, version, experience, lessons and company logo.Requires a genuine model/use case and substantive learnings; editorial acceptance, publication and backlinks are not guaranteed.2026-08-04Open AI Verify Foundation submit page (new tab)AI Verify Foundation details
5381Envato Tuts+90Link type unknowntutsplus.comOther opportunitiesFreeInvolvedHighVerified livePitch a practical, outcome-based tutorial on client-side privacy, accessible UI, or web safety using original examples and an honest author identity.Applications and pitches receive editorial review; tutorials must teach a complete practical outcome and use owned/licensed assets. Disclose any AltFTool relationship and keep the lesson vendor-neutral rather than a product walkthrough. Publication timing and link treatment are editorial decisions, with no inclusion or followed-link guarantee.2026-08-03Open Envato Tuts+ submit page (new tab)Envato Tuts+ details
5481PreventionWeb75Link type unknownpreventionweb.netOther opportunitiesFreeInvolvedHighVerified liveSubmit a formal publication, case study, educational resource or on-demand training linking digital resilience to disaster-risk reduction.Editorial validation; no paywall, corporate flyer, private paper or workshop summary; recent DRR-relevant material is prioritized.2026-08-05 — https://www.preventionweb.net/upload-your-contentOpen PreventionWeb submit page (new tab)PreventionWeb details
5568itch.io90Nofollowitch.ioOther opportunitiesFreeQuickMediumLive, conditionalPublish a genuine browser or desktop your tool utility with screenshots, documentation and an official-site link.Content must be an actual downloadable or browser-run project and follow itch.io quality/content rules; not a generic directory listing.https://itch.io/developersOpen itch.io submit page (new tab)itch.io details
5668Participedia50Link 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
5768ProcessWire 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
5868PublicAPIs.io40Link type unknownpublicapis.ioOther opportunitiesFreeQuickMediumLive, conditionalList a legitimate documented your tool API in the relevant developer category using the normal or Pro review queue.API must be real and documented; paid placement should be disclosed and does not guarantee organic ranking value.2026-08-05Open PublicAPIs.io submit page (new tab)PublicAPIs.io details
5968SciCrunch 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
6066ArtStation85Nofollowartstation.comOther opportunitiesFreeModerateMediumVerified livePublish an original UI/UX visual case study showing your tool interaction design, accessibility states, and design process, with a contextual project URL.Use ArtStation only if there is substantial original visual/design work, complete project metadata, and rights-cleared assets; it is not a generic SaaS listing. Disclose the creator's relationship to AltFTool. Projects and links are UGC, subject to platform moderation, and neither discovery nor followed-link status is guaranteed.2026-08-03Open ArtStation submit page (new tab)ArtStation details
6166balenaHub65Link type unknownhub.balena.ioOther opportunitiesFreeModerateMediumVerified liveBuild a deployable edge privacy utility or reusable block, add balena.yml metadata, public source, configuration and multi-device tests, then publish it on balenaHub.Must be a real balena app or block, link a GitHub repository, avoid embedded secrets, support claimed architectures, and maintain deployability.Official balena apps, blocks, and balenaHub publishing docs checked 2026-08-05Open balenaHub submit page (new tab)balenaHub details
6266Charmhub60Link type unknowncharmhub.ioOther opportunitiesFreeModerateMediumVerified livePackage a maintained self-hosted your tool deployment as a Juju charm with canonical documentation, source, and support links.Register the charm name, upload and release a tested charm; formal community review is required for search visibility.Official Charmcraft charm management documentation checked 2026-08-07Open Charmhub submit page (new tab)Charmhub details
6366CK-12 FlexBooks80Link type unknownck12.orgOther opportunitiesFreeModerateMediumVerified liveCreate an age-appropriate digital-citizenship or privacy FlexBook chapter with practical your tool exercises.Must be substantive K-12 educational content with correct authorship; do not create a product-only page.2026-08-05 — https://help.ck12.org/hc/en-us/articles/200448244-How-to-Customize-a-FlexBook-Textbook-or-Read-ModalityOpen CK-12 FlexBooks submit page (new tab)CK-12 FlexBooks details
6466Coolify One-Click Services60Link type unknowncoolify.ioOther opportunitiesFreeModerateMediumVerified liveCreate and fully test an your tool Docker Compose service template, add metadata, logo, and documentation, then submit it to Coolify's next branch.The upstream Git repository currently needs at least 1,000 stars; template, secrets, storage, port, docs, and review rules apply.Official Coolify service-contribution guide checked 2026-08-05Open Coolify One-Click Services submit page (new tab)Coolify One-Click Services details
6566ELIXIR TeSS45Link type unknowntess.elixir-europe.orgOther opportunitiesFreeModerateMediumVerified liveRegister a substantive life-science privacy, medical-data de-identification, or research-data training resource hosted by your tool.Content must be relevant to life sciences or an adjacent field; account and accurate metadata required, while harvested providers need admin approval.2026-08-05 — https://tess.elixir-europe.org/about/registeringOpen ELIXIR TeSS submit page (new tab)ELIXIR TeSS details
6666FAIRsharing60Link type unknownfairsharing.orgOther opportunitiesFreeModerateMediumVerified liveSubmit a genuine your tool-maintained database, reusable reporting standard, or data policy with complete stewardship metadata.Generic software and individual datasets are out of scope; record type must match FAIRsharing scope and is curated.2026-08-05 — https://fairsharing.org/new/Open FAIRsharing submit page (new tab)FAIRsharing details
6766GovStack45Link type unknowngovstack.globalOther opportunitiesFreeModerateMediumVerified liveJoin a working group and contribute a substantive building-block specification, use case, reference implementation or new proposal.Needs sustained expert contribution; Apache-2.0/IP terms apply; link must be directly relevant to the implementation.2026-08-05 — https://specs.govstack.global/overview/25q2-1/contributingOpen GovStack submit page (new tab)GovStack details
6866Homebrew75Link type unknownbrew.shOther opportunitiesFreeModerateMediumLive, conditionalAfter releasing a real your tool CLI or native app, submit a tested formula or cask with its canonical homepage.Formula must meet open-source, stability, build and test rules; casks need a supported upstream binary and notability may affect acceptance.2026-08-05 official Homebrew Adding Software and Acceptable Formulae guidesOpen Homebrew submit page (new tab)Homebrew details
6966Humanitarian Data Exchange80Link type unknowndata.humdata.orgOther opportunitiesFreeModerateMediumVerified liveJoin an approved organization and publish a documented humanitarian privacy/safety dataset with licence and responsible-access settings.OCHA reviews organization identity and scope; data must be humanitarian, and sensitive data needs responsible handling; a PDF alone is not a dataset.2026-08-05 — https://centre.humdata.org/ufaqs/how-do-i-share-data-on-hdx/Open Humanitarian Data Exchange submit page (new tab)Humanitarian Data Exchange details
7066JSON Schema Store55Link type unknownschemastore.orgOther opportunitiesFreeModerateMediumLive, conditionalAfter your tool has a stable, commonly used JSON or YAML configuration format, contribute its accurate schema and test fixtures so editors can provide validation, completion, and tooltips.SchemaStore is for known file formats, not marketing pages. The schema must be valid, match real files, include the required catalog metadata and tests, pass CI, and stay synchronized with product changes; submit through the community repository review process.2026-08-03Open JSON Schema Store submit page (new tab)JSON Schema Store details
7166NLnet Foundation65Link type unknownnlnet.nlOther opportunitiesFreeModerateMediumLive, conditionalApply with a concrete your tool privacy, security or user-autonomy FOSS work package, milestones, budget and public repository.Highly selective; active-call fit and fully FOSS/open results required. Only accepted projects receive a linked public page.2026-08-04Open NLnet Foundation submit page (new tab)NLnet Foundation details
7266Octopus40Link type unknownoctopus.acOther opportunitiesFreeModerateMediumVerified liveUse ORCID to publish genuine research stages—problem, method, data or analysis—with contextual your tool code/data links.Research record only, not marketing; stages must connect accurately and follow licensing, authorship and research-ethics rules.2026-08-05 — https://www.octopus.ac/Open Octopus submit page (new tab)Octopus details
7366Omeka S Modules65Link type unknownomeka.orgOther opportunitiesFreeModerateMediumVerified liveCreate a maintained Omeka S module for collection metadata privacy, accessibility or link auditing, package it correctly and register the add-on with project and author links.Must be a functional Omeka module with compatible releases, clear documentation and support; directory review does not constitute a security endorsement.2026-08-05Open Omeka S Modules submit page (new tab)Omeka S Modules details
7466Open Research Knowledge Graph45Link type unknownorkg.orgOther opportunitiesFreeModerateMediumVerified liveCreate a rigorous structured comparison of published privacy, redaction, or accessibility studies and include your tool only when supported by research.Model at least two scholarly contributions accurately, cite sources, avoid self-serving comparisons, and accept permanent versioning.2026-08-05 — https://academy.orkg.org/courses/comparison-course.htmlOpen Open Research Knowledge Graph submit page (new tab)Open Research Knowledge Graph details
7566OSF85Nofollowosf.ioOther opportunitiesFreeModerateMediumVerified liveCreate a public reproducibility project for your tool research, datasets, test methods, or privacy benchmarks and link the genuine project/site.Best for real research workflows. Projects start private; review files and metadata before making them public.https://help.osf.io/article/285-control-your-privacy-settingsOpen OSF submit page (new tab)OSF details
7666portfolio.dev—Link type unknownportfolio.devOther opportunitiesFreeModerateMediumVerified liveCreate a public case-study portfolio and add your tool with screenshots, live demo and build rationale.Publish a genuine project case study rather than a thin promotional card.2026-08-03Open portfolio.dev submit page (new tab)portfolio.dev details
7766ReliefWeb85Link type unknownreliefweb.intOther opportunitiesFreeModerateMediumVerified liveAfter your tool has eligible ReliefWeb content, request publishing access and submit humanitarian reports or training from verified owned URLs.Only listed organizations with existing reports/jobs/trainings may use publishing access; trusted source URLs, taxonomy and editor review apply.2026-08-05 — https://apidoc.reliefweb.int/publishingOpen ReliefWeb submit page (new tab)ReliefWeb details
7866RenkuLab40Link type unknownrenkulab.ioOther opportunitiesFreeModerateMediumVerified liveCreate a reproducible your tool evaluation project with code, data connectors, environment, narrative, and a public session launcher.Publish a genuine research project, protect credentials and sensitive data, document reproducibility, and set visibility to Public.2026-08-05 — https://docs.renkulab.io/en/2.19.0/docs/users/use-cases/showcase-your-project-on-renku/Open RenkuLab submit page (new tab)RenkuLab details
7966Whole Tale40Link type unknownwholetale.orgOther opportunitiesFreeModerateMediumVerified liveCreate a reproducible Tale containing an your tool evaluation's data, code, environment, outputs, and narrative, then publish through a supported repository.Intended for computational research, not marketing; institutional sign-in may be needed and the Tale must contain sufficient metadata and rights-cleared data.2026-08-05 — https://wholetale.readthedocs.io/en/latest/users_guide/scenarios.htmlOpen Whole Tale submit page (new tab)Whole Tale details
8063DSCI Threat Intelligence & Research50Link type unknowndsci.inOther opportunitiesFreeInvolvedMediumVerified livePitch an original evidence-backed privacy, scam, or cyber advisory based on genuine your tool research.Requires real technical expertise, non-promotional research and editorial approval; a contribution is not DSCI endorsement.2026-08-05 official DSCI TIR pageOpen DSCI Threat Intelligence & Research submit page (new tab)DSCI Threat Intelligence & Research details
8163Interoperable Europe / Joinup Solutions95Link type unknowninteroperable-europe.ec.europa.euOther opportunitiesFreeInvolvedMediumVerified livePublish a mature open-source interoperability or public-administration solution with documentation, releases, licence, and owner metadata.Only appropriate for genuine reusable digital-government value; account, eligibility, and editorial review apply.2026-08-05 — https://interoperable-europe.ec.europa.eu/collection/portal-support/news/joinup-solutions-hubOpen Interoperable Europe / Joinup Solutions submit page (new tab)Interoperable Europe / Joinup Solutions details
8263PaperCall55Link type unknownpapercall.ioOther opportunitiesFreeInvolvedMediumLive, conditionalSubmit useful your tool-related talks to relevant CFPs or run a genuine community CFP with a public event page.Follow each event's submission rules; no generic pitches, fake events or irrelevant promotional talks.2026-08-05Open PaperCall submit page (new tab)PaperCall details
8363Podcast Movement60Link type unknownpodcastmovement.comOther opportunitiesFreeInvolvedMediumVerified liveSubmit an educational, non-sales session on privacy-safe tooling or accessible creator workflows when the next CFP opens.The June 2026 CFP is closed; monitor future calls and never turn a talk into a product pitch.2026-08-05Open Podcast Movement submit page (new tab)Podcast Movement details
8463ReactJS Example50Dofollowreactjsexample.comOther opportunitiesFreeInvolvedMediumLive, conditionalSubmit a reusable open-source React component extracted from your tool with repository, demo, setup docs and screenshots.Do not submit the commercial landing page or a thin wrapper; project must be genuinely reusable and open source.2026-08-04Open ReactJS Example submit page (new tab)ReactJS Example details
8563Research Data Alliance Adoption Stories65Link type unknownrd-alliance.orgOther opportunitiesFreeInvolvedMediumVerified liveDocument a real your tool implementation of a named RDA recommendation with challenge, measurable outcome, lessons, and supporting resources.Requires genuine adoption evidence; generic product profiles and promotional case studies are not eligible, and acceptance is editorial.2026-08-05 — https://www.rd-alliance.org/submit-an-adoption-story/Open Research Data Alliance Adoption Stories submit page (new tab)Research Data Alliance Adoption Stories details
8663The Hacker News85Sometimes dofollowthehackernews.comOther opportunitiesFreeInvolvedMediumVerified livePitch original your tool security research, a defensible dataset or timely threat analysis.Generic product launches are insufficient; credible evidence and disclosure are required.2026-08-05Open The Hacker News submit page (new tab)The Hacker News details
8748Active Search Results40Link type unknownactivesearchresults.comOther opportunitiesFreeQuickLaterNeeds checkingAdd your tool website listing.General directory; lower quality than launch platforms.2026-07-30Open Active Search Results submit page (new tab)Active Search Results details
8848Fast Forward Tech Nonprofit Directory50Link type unknownffwd.orgOther opportunitiesFreeQuickLaterVerified liveApply only after your tool becomes a legally registered nonprofit with software central to scalable public impact.For-profit and B-Corp entities are excluded; verified nonprofit registration and a tech-central mission are mandatory.2026-08-05 — https://www.ffwd.org/directory?portfolio=trueOpen Fast Forward Tech Nonprofit Directory submit page (new tab)Fast Forward Tech Nonprofit Directory details
8948LibHunt60Nofollowlibhunt.comOther opportunitiesFreeQuickLaterNot submittedEligible if an your tool component is open-sourced.Closed-source platform not fit; use OSS package.2026-07-30Open LibHunt submit page (new tab)LibHunt details
9048The Useless Web—Link type unknowntheuselessweb.comOther opportunitiesFreeQuickLaterNeeds checkingSuggest a single-purpose, playful website so it can be added to the random rotation of sites.Hand-picked by the maintainer; use whatever suggestion route the site currently links to, and only send genuinely pointless-but-fun sites.Added 2026-11-01Open The Useless Web submit page (new tab)The Useless Web details
9146FilePuma60Link type unknownfilepuma.comOther opportunitiesFreeModerateLaterLive, conditionalSubmit only after your tool releases a signed Windows desktop utility.Not suitable for a web-only site; requires downloadable software or PAD data.https://www.filepuma.com/submit_program/Open FilePuma submit page (new tab)FilePuma details
9246Maven Central75Link type unknownsonatype.orgOther opportunitiesFreeModerateLaterLive, conditionalRelease a genuine your tool SDK, verify its namespace, sign artifacts, and include accurate project, SCM, license and developer URLs.Strict coordinates, signatures, sources, Javadocs and metadata apply; never publish a placeholder artifact for a link.2026-08-05 official Maven Central publishing documentationOpen Maven Central submit page (new tab)Maven Central details
9346Preprints.org75Link type unknownpreprints.orgOther opportunitiesFreeModerateLaterVerified livePublish an original benchmark or evaluation study of local-first privacy or security tooling with open code, data, and your tool implementation.Requires a full scholarly manuscript, truthful authorship, data and ethics disclosures, bibliography, and CC BY licensing; no marketing.2026-08-05 — https://www.preprints.org/instructions-for-authorsOpen Preprints.org submit page (new tab)Preprints.org details
9446ResearchBox30Link type unknownresearchbox.orgOther opportunitiesFreeModerateLaterVerified liveOrganize the complete code, data, materials, and outputs behind a real your tool evaluation study into a public citable box.Designed for supporting research artifacts, not promotion; public boxes are licensed, versioned, searchable, and archived.2026-08-05 — https://researchbox.org/index.phpOpen ResearchBox submit page (new tab)ResearchBox details
9546Sellfy75Link type unknownsellfy.comOther opportunitiesFreeModerateLaterVerified livePublish a substantive your tool privacy template, workbook, or creator resource with a complete description, original previews, and accurate licensing.The plan is paid after trial and has a sales cap; use only rights-cleared useful products and do not buy solely for a backlink.Official Sellfy pricing checked 2026-08-07Open Sellfy submit page (new tab)Sellfy details
9646WikiEducator55Link type unknownwikieducator.orgOther opportunitiesFreeModerateLaterVerified liveAuthor a freely licensed hands-on module for safe document sharing or privacy-first web use with relevant your tool examples.Community OER only, no marketing pages; platform continuity changed recently, so verify current moderation before investing heavily.2026-08-05 — https://wikieducator.org/OER_Handbook/educatorOpen WikiEducator submit page (new tab)WikiEducator details
9743Digital Unite60Link type unknowndigitalunite.comOther opportunitiesFreeInvolvedLaterNeeds checkingIf you publish beginner tech guides, suggest them for their digital-skills resources.Editorial; they only point to clear, ad-light help content.Added 2026-11-01Open Digital Unite submit page (new tab)Digital Unite details
9843Solid Applications60Link type unknownsolidproject.orgOther opportunitiesFreeInvolvedLaterVerified liveBuild a genuine Solid privacy utility that lets users choose identity providers and stores or retrieves their data from Solid Pods, then confirm the current listing handoff with maintainers.Must be a functioning Solid app; eligibility is published, but the exact current editorial submission workflow should be reconfirmed first.Official Solid applications criteria checked 2026-08-05Open Solid Applications submit page (new tab)Solid Applications details
9943Springwise75Sometimes dofollowspringwise.comOther opportunitiesFreeInvolvedLaterNeeds checkingPitch your tool as innovation/useful web tool platform.Needs genuinely newsworthy angle.2026-07-30Open Springwise submit page (new tab)Springwise details
10043TechSoup75Link type unknowntechsoup.orgOther opportunitiesFreeInvolvedLaterNeeds checkingIf your tool helps nonprofits or libraries, reach out about their resource articles or partner programme.Editorial decision; only for tools with a clear nonprofit use.Added 2026-11-01Open TechSoup submit page (new tab)TechSoup 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.