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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

1–97 of 97 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
198Genially80Nofollowgenially.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
298Open 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
398Spreaker85Nofollowspreaker.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
495Podbean85Nofollowpodbean.comOther opportunitiesFree + paid tierModerateDo firstLive, conditionalPublish a real your tool episode and add contextual links to resources actually discussed in its show notes.No keyword stuffing or shell podcast; some custom show and episode website fields require Unlimited Audio or higher.2026-08-04Open Podbean submit page (new tab)Podbean details
588FOSS United Grants45Link type unknownfossunited.orgOther opportunitiesPaidModerateDo firstLive, conditionalPropose a genuinely open-source, privacy-preserving your tool component with a public roadmap, Indian community benefit, budget, milestones, and maintenance plan.Funding is for FOSS creators, maintainers, projects, and communities in India; a closed-source commercial site or a marketing-only proposal is not eligible.2026-08-03Open FOSS United Grants submit page (new tab)FOSS United Grants details
684Amazon 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
784Bitrise 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
884Castbox75Nofollowcastbox.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
984CrowdSec 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
1084Daggerverse60Link 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
1184Indie 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
1284Internet.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
1384JS.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
1484Langflow 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
1584LinuxLinks60Dofollowlinuxlinks.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
1684Maven70Link 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
1784Mixcloud90Nofollowmixcloud.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
1884MoodleNet65Link 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
1984New 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
2084ODI 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
2184OPA 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
2284Open 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
2384OpenLearn 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
2484Payhip75Link 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
2584Podcast 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
2684REUSE 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
2784Scalar50Link 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
2884Snakemake 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
2984Spotify 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
3084StackBlitz85Nofollowstackblitz.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
3184Swagger 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
3284Wikiversity85Nofollowen.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
3384Working 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
3484YunoHost 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
3581Apple Podcasts for Creators100Nofollowpodcasters.apple.comOther opportunitiesFree + paid tierModerateHighLive, conditionalSubmit a genuine your tool podcast RSS feed in Podcasts Connect and include the official show website in valid metadata.Requires at least one episode, compliant RSS, artwork, content rights, technical validation, and Apple review.2026-08-05Open Apple Podcasts for Creators submit page (new tab)Apple Podcasts for Creators details
3681Luma80Nofollowluma.comOther opportunitiesFree + paid tierModerateHighLive, conditionalPublish a real your tool webinar, demo or workshop with a contextual canonical link in its event details.Event details and host identity must be genuine; do not create empty or duplicate promotional events.2026-08-05Open Luma submit page (new tab)Luma details
3781Replit85Nofollowreplit.comOther opportunitiesFree + paid tierModerateHighVerified livePublish a focused open your tool demo or developer utility and link its canonical your tool page from the app and project description.A real working app is required; publishing may request a payment method and hosting usage can cost money.https://docs.replit.com/learn/projects-and-artifacts/replit-deploymentsOpen Replit submit page (new tab)Replit details
3881Skillshare90Nofollowskillshare.comOther opportunitiesFree + paid tierModerateHighVerified liveApply with an original class outline and teaching sample for privacy-safe design, accessibility, or a practical productivity workflow, then build the class project and lessons if approved.First-time teachers require approval; applications are currently English-only and must fit accepted or in-demand categories. Every class must meet content and class-quality guidelines and cannot function as an advertisement.2026-08-03Open Skillshare submit page (new tab)Skillshare details
3980NASSCOM Membership70Link type unknownnasscom.inOther opportunitiesNot statedModerateHighLive, conditionalApply using an India-registered your tool company/startup and provide the required entity and revenue documents.Due diligence may take 10–15 business days and include documents, calls or a site visit; membership is not guaranteed.2026-08-04Open NASSCOM Membership submit page (new tab)NASSCOM Membership details
4074Civic Tech Field Guide40Link type unknowncivictech.guideOther opportunitiesPaidModerateHighVerified liveSubmit only your tool tools with a clear civic or public-interest use case, using the official project name, URL, one-sentence description, accurate category, and contact email.The project must genuinely fit civic technology or an adjacent public-interest field. Submissions enter a moderation queue; quote third-party text only with attribution and do not treat the form as a generic SaaS directory.2026-08-03Open Civic Tech Field Guide submit page (new tab)Civic Tech Field Guide details
4174IAAP45Link type unknownaccessibilityassociation.orgOther opportunitiesPaidModerateHighLive, conditionalEnroll an eligible your tool entity as a small-organization Associate Corporate member and opt into the directory.Approval and membership terms apply; strong fit requires genuine accessibility practice and participation.2026-08-04Open IAAP submit page (new tab)IAAP details
4274MyData Global45Link type unknownmydata.orgOther opportunitiesPaidModerateHighLive, conditionalJoin as an eligible small business and opt in to publication of your tool organization name and profile.Strong fit only if AltFTool commits to human-centric data-rights principles; not for backlink-only membership.2026-08-04Open MyData Global submit page (new tab)MyData Global details
4366ArtStation85Nofollowartstation.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
4466balenaHub65Link 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
4566Charmhub60Link 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
4666CK-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
4766Coolify 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
4866ELIXIR 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
4966FAIRsharing60Link 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
5066GovStack45Link 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
5166Homebrew75Link 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
5266Humanitarian 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
5366JSON 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
5466NLnet 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
5566Octopus40Link 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
5666Omeka 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
5766Open 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
5866OSF85Nofollowosf.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
5966portfolio.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
6066ReliefWeb85Link 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
6166RenkuLab40Link 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
6266Whole 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
6363BCcampus Open Collection70Link type unknownbccampus.caOther opportunitiesFree + paid tierModerateMediumVerified livePublish a Canadian-ready, openly licensed privacy or digital-citizenship textbook and use Contribute → Suggest a Textbook.Needs textbook-style objectives and activities, editable open licence/source files, accessible formats and Canadian relevance.2026-08-05 — https://collection.bccampus.ca/about/Open BCcampus Open Collection submit page (new tab)BCcampus Open Collection details
6463Buzzsprout85Sometimes dofollowbuzzsprout.comOther opportunitiesFree + paid tierModerateMediumLive, conditionalLaunch a real your tool educational podcast, complete its public site, and cite relevant tools and sources in useful show notes.Choose one primary host; publish original episodes and do not duplicate feeds solely to manufacture links.2026-08-05Open Buzzsprout submit page (new tab)Buzzsprout details
6563Calaméo85Nofollowcalameo.comOther opportunitiesFree + paid tierModerateMediumVerified livePublish a polished original guide, research brief, or accessibility zine as a public document, with useful references and a relevant your tool link inside the editorial content.Public publications are searchable and reusable through platform features; upload only lawful content AltFTool owns or licenses. BASIC includes limited features/advertising, and abusive SEO, spam, or promotional document dumping is explicitly prohibited.2026-08-03Open Calaméo submit page (new tab)Calaméo details
6663Cargo75Sometimes dofollowcargo.siteOther opportunitiesFree + paid tierModerateMediumLive, conditionalCreate an authentic your tool or founder design portfolio with substantive case studies and contextual links to shipped tools.Use only real design/product work; public pages may be indexed, but do not create a thin backlink microsite.2026-08-04Open Cargo submit page (new tab)Cargo details
6763Crevado60Sometimes dofollowcrevado.comOther opportunitiesFree + paid tierModerateMediumNot submittedCreate a complete your tool product case study and add the canonical URL naturally within project text or a linked image.Keep the portfolio public and substantive; custom-domain and other advanced features may require Premium.2026-08-03Open Crevado submit page (new tab)Crevado details
6863Journo Portfolio50Sometimes dofollowjournoportfolio.comOther opportunitiesFree + paid tierModerateMediumNot submittedCreate a founder portfolio with original your tool launch notes or product case studies and use an external-link page for the canonical website.The free plan is limited to a home page and ten items; publish meaningful original work, not a backlink-only shell.2026-08-03Open Journo Portfolio submit page (new tab)Journo Portfolio details
6963Milkshake50Link type unknownmilkshake.appOther opportunitiesFree + paid tierModerateMediumVerified liveBuild a free mobile your tool mini-site with brand story, key collections, demos and contact links.App-based setup; publish substantive cards instead of a bare backlink page.2026-08-04Open Milkshake submit page (new tab)Milkshake details
7063Portship—Link type unknownportship.appOther opportunitiesFree + paid tierModerateMediumVerified liveClaim a builder profile and add your tool as a shipped project using its live public URL.Best for genuinely AI-assisted builds; keep project status and ownership accurate.2026-08-03Open Portship submit page (new tab)Portship details
7163pretalx55Link type unknownpretalx.comOther opportunitiesFree + paid tierModerateMediumLive, conditionalUse pretalx for a genuine your tool community conference or submit relevant talks to events that use the platform.Public pages require a real conference and accepted content; trial-only pages are not a backlink strategy.2026-08-05Open pretalx submit page (new tab)pretalx details
7263Zotero Groups80Nofollowzotero.orgOther opportunitiesFree + paid tierModerateMediumVerified liveCreate a public privacy-tool research library with credible standards, papers, and references, including only genuinely relevant your tool documentation.Curate a real scholarly collection rather than a promotional list; public-open groups cannot share files, and visibility depends on settings.Official Zotero Groups documentation checked 2026-08-07Open Zotero Groups submit page (new tab)Zotero Groups details
7362IBM Cloud Catalog95Nofollowibm.comOther opportunitiesNot statedModerateMediumVerified livePackage a deployable self-hosted your tool architecture for IBM Cloud, complete Partner Center onboarding, and request public catalog approval.A working deployable architecture, complete onboarding checklist, testing, approval, ongoing maintenance, and deprecation management are required.Official IBM Cloud catalog publishing documentation checked 2026-08-07Open IBM Cloud Catalog submit page (new tab)IBM Cloud Catalog details
7462Red Hat Ecosystem Catalog95Link type unknownredhat.comOther opportunitiesNot statedModerateMediumVerified livePackage a supported self-hosted your tool edition or integration for RHEL or OpenShift and complete Red Hat Partner Validation for a catalog page.Must genuinely run on and support RHEL or OpenShift; partner statements, documentation, validation, and Red Hat review are required.Official Red Hat Partner Validation Guide for 2026 checked 2026-08-07Open Red Hat Ecosystem Catalog submit page (new tab)Red Hat Ecosystem Catalog details
7556Digital Public Goods Alliance55Link type unknowndigitalpublicgoods.netOther opportunitiesPaidModerateMediumVerified liveAfter your tool has a genuinely open-source, well-documented public-interest component, complete the eligibility assessment and nominate that specific component.High bar: open licensing, ownership, documentation, platform independence, standards, privacy, security, non-PII handling, lawful content, and Sustainable Development Goal relevance must all be evidenced. Nomination is not guaranteed recognition.2026-08-03Open Digital Public Goods Alliance submit page (new tab)Digital Public Goods Alliance details
7656Dunked50Link type unknowndunked.comOther opportunitiesPaidModerateMediumLive, conditionalCreate a portfolio for genuine your tool product/design work and use each project's external URL field for the matching live page.Only showcase work actually produced; complete project descriptions and avoid duplicate promotional pages.2026-08-04Open Dunked submit page (new tab)Dunked details
7756Format75Sometimes dofollowformat.comOther opportunitiesPaidModerateMediumNot submittedCreate a founder or product-design portfolio with an original your tool case study and add the canonical site as an external menu link.This is a paid portfolio platform; the case study should demonstrate real work and should not exist only to manufacture a link.2026-08-03Open Format submit page (new tab)Format details
7856Lemon Squeezy70Nofollowlemonsqueezy.comOther opportunitiesPaidModerateMediumLive, conditionalCreate a legitimate free or paid your tool resource or software product and publish it on a branded hosted storefront.Store activation requires identity and business review; never create a dummy product only for a link.2026-08-05Open Lemon Squeezy submit page (new tab)Lemon Squeezy details
7956Open Technology Fund65Link type unknownopentech.fundOther opportunitiesPaidModerateMediumLive, conditionalApply only with a validated open-source privacy or anti-surveillance project that directly helps users facing repressive censorship or surveillance.OTF requires concrete internet-freedom impact and identifiable beneficiary communities in repressive environments; a generic privacy-tool catalogue or claim that it helps everyone will not qualify.2026-08-03Open Open Technology Fund submit page (new tab)Open Technology Fund details
8056OpenSSF70Link type unknownopenssf.orgOther opportunitiesPaidModerateMediumLive, conditionalApply as a General Member only if your tool will meaningfully contribute engineering or resources to open-source security.Not worthwhile for a backlink alone; free Associate tier is restricted to qualifying nonprofits, academia or government.2026-08-04Open OpenSSF submit page (new tab)OpenSSF details
8156Principles for Digital Development55Link type unknowndigitalprinciples.orgOther opportunitiesPaidModerateMediumVerified liveObtain senior approval, submit the signed endorsement materials, implement the Principles and share a real case study.This is a public operational commitment; organization must apply the Principles in policy/process and participate in the community.2026-08-05 — https://digitalprinciples.org/endorsers/Open Principles for Digital Development submit page (new tab)Principles for Digital Development details
8246FilePuma60Link 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
8346Maven 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
8446Preprints.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
8546ResearchBox30Link 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
8646Sellfy75Link 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
8746WikiEducator55Link 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
8842Foundation for Public Code45Link type unknownpubliccode.netOther opportunitiesNot statedModerateLaterVerified liveIf an your tool component is built with or for a public body, publish a standards self-assessment and pursue stewardship/assessment.Requires reusable, documented public-purpose OSS developed with/for public organizations; certification remains conditional.2026-08-05 — https://standard.publiccode.net/README.htmlOpen Foundation for Public Code submit page (new tab)Foundation for Public Code details
8936Agentic AI Foundation—Link type unknownaaif.ioOther opportunitiesPaidModerateLaterVerified liveApply only with a meaningful open agent-security or MCP-governance contribution and an ongoing participation plan.Linux Foundation prerequisites and parent-company headcount rules apply; associate status is restricted and membership is not certification.2026-08-05 official Agentic AI Foundation members pageOpen Agentic AI Foundation submit page (new tab)Agentic AI Foundation details
9036CiviCERT40Link type unknowncivicert.orgOther opportunitiesPaidModerateLaterVerified liveApply only after operating a real civil-society digital-security help desk and meeting network operations and vetting requirements.Adopt vetting/information policies and code of conduct, track cases/share threats, and obtain vouches from two members at different organizations.2026-08-05 — https://www.civicert.org/apply-to-be-a-member/Open CiviCERT submit page (new tab)CiviCERT details
9136Directory of Open Access Books70Link type unknowndoabooks.orgOther opportunitiesPaidModerateLaterVerified liveApply only after your tool operates a genuine OA scholarly-book publishing program, then submit peer-reviewed privacy-tech books.Publisher-level path, not a one-off product listing; transparent peer review, open licences, HTTPS publishing site and scholarly books required.2026-08-05 — https://www.doabooks.org/en/publishers/join-doabOpen Directory of Open Access Books submit page (new tab)Directory of Open Access Books details
9236Fabrik55Sometimes dofollowfabrik.ioOther opportunitiesPaidModerateLaterLive, conditionalPublish real your tool film, design, illustration or product case studies and connect them to the appropriate project pages.Strong creative-work fit only; no credit card for trial, but a lasting public portfolio requires a paid plan.2026-08-04Open Fabrik submit page (new tab)Fabrik details
9336Krop55Sometimes dofollowkrop.comOther opportunitiesPaidModerateLaterLive, conditionalBuild a real founder or your tool creative portfolio and link relevant case studies to the corresponding live tools.Designed for creative professionals; paid ongoing hosting and authentic portfolio work are required.2026-08-04Open Krop submit page (new tab)Krop details
9436LF AI & Data Foundation55Link type unknownlfaidata.foundationOther opportunitiesPaidModerateLaterVerified liveJoin only when your tool will fund and actively contribute to open-source AI or data work.Linux Foundation corporate membership rules apply; free associate status is limited to approved nonprofits, projects or government bodies.2026-08-05 official LF AI & Data join pageOpen LF AI & Data Foundation submit page (new tab)LF AI & Data Foundation details
9536OASIS Open80Link type unknownoasis-open.orgOther opportunitiesPaidModerateLaterVerified liveJoin only to contribute substantively to relevant security or privacy technical committees and use approved organization metadata.Reconfirm current dues before purchase; membership is not endorsement and lower tiers may not include a linked logo.2026-08-05 official OASIS join and members pagesOpen OASIS Open submit page (new tab)OASIS Open details
9636Open Source Initiative85Link type unknownopensource.orgOther opportunitiesPaidModerateLaterVerified liveAfter releasing meaningful OSI-licensed code, consider sponsorship only when supporting OSI aligns with your tool strategy.Financial sponsorship is not certification, governance influence or product endorsement; do not pay solely for a backlink.2026-08-05 official OSI benefits and sponsorship documentOpen Open Source Initiative submit page (new tab)Open Source Initiative details
9736Stan Store70Nofollowstan.storeOther opportunitiesPaidModerateLaterLive, conditionalUse only if your tool has a genuine creator offer, guide or service; complete the storefront and connect relevant site pages.Paid commercial fit required; do not open an empty store solely for a backlink.2026-08-04Open Stan Store submit page (new tab)Stan Store 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.