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
All filters2
The table is wider than the screen — swipe it sideways for cost, effort and the preparation notes.
| # | Impact (sorted) | Site — sort by this | Est. DA — sort by this | Link | Domain | Type | Cost | Effort — sort by this | Priority | Status | What to prepare | Rules / caveat | Checked | Actions |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 48 | Campsite.bio | 55 | Nofollow | campsite.bio | Profiles and entities | Free | Quick | Later | Verified live | Create an your tool profile and add genuinely useful homepage, privacy-tool and accessibility-tool links. | Free plan supports unlimited links; keep labels descriptive and the profile authentic. | 2026-08-04 | Open Campsite.bio submit page (new tab)Campsite.bio details |
| 2 | 48 | DuckDB Community Extensions | 70 | Link type unknown | duckdb.org | Marketplaces and app stores | Free | Quick | Later | Verified live | Build table functions that import, normalize and query your tool report JSON or NDJSON with typed findings, then submit the extension descriptor for central build and distribution. | Requires public open-source GitHub code, CMake build and supported toolchains/platforms; demonstrate value beyond DuckDB's generic JSON reader. | 2026-08-05 | Open DuckDB Community Extensions submit page (new tab)DuckDB Community Extensions details |
| 3 | 48 | Fast Forward Tech Nonprofit Directory | 50 | Link type unknown | ffwd.org | Other opportunities | Free | Quick | Later | Verified live | Apply 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=true | Open Fast Forward Tech Nonprofit Directory submit page (new tab)Fast Forward Tech Nonprofit Directory details |
| 4 | 48 | Gentoo Packages | 75 | Link type unknown | packages.gentoo.org | Developer registries | Free | Quick | Later | Verified live | Prepare and test a policy-compliant ebuild for a stable your tool CLI, including accurate HOMEPAGE and source metadata, then work with a Gentoo developer or proxy maintainer for repository inclusion. | Search existing new-package bugs first; ebuilds must install usable software, pass pkgcheck, use tested architecture keywords and remain maintained. Non-developers cannot directly push to the official tree. | 2026-08-05 | Open Gentoo Packages submit page (new tab)Gentoo Packages details |
| 5 | 48 | HaikuDepot | 55 | Link type unknown | depot.haiku-os.org | Developer registries | Free | Quick | Later | Verified live | Port a functional your tool desktop or CLI utility to Haiku, write and test a compliant recipe, then submit a feature-branch pull request to HaikuPorts. | Software must actually run on Haiku and remain maintainable; HaikuDepot's outbound homepage rendering and link attributes should be rechecked before prioritising. | 2026-08-05 | Open HaikuDepot submit page (new tab)HaikuDepot details |
| 6 | 48 | ModelDB | 40 | Link type unknown | modeldb.science | Developer registries | Free | Quick | Later | Verified live | Submit a licensed computational neuroscience model with code ZIP, publication citation, overview, contributors, and tags. | Public models generally require an associated scientific publication; generic privacy tools do not qualify. | Official ModelDB submission form checked 2026-08-05 | Open ModelDB submit page (new tab)ModelDB details |
| 7 | 48 | OctoPrint Plugin Repository | 50 | Link type unknown | plugins.octoprint.org | Marketplaces and app stores | Free | Quick | Later | Verified live | Build a maintained OctoPrint plugin for a credible your tool-related workflow such as privacy-safe print logs or metadata checks, then register it through the official repository pull request. | Only pursue a genuine OctoPrint use case; maintainers are responsible for API compatibility, bugs and security fixes, and the repository's CI must accept the listing metadata. | 2026-08-05 | Open OctoPrint Plugin Repository submit page (new tab)OctoPrint Plugin Repository details |
| 8 | 48 | OpenDOAR | 65 | Link type unknown | opendoar.ac.uk | Developer registries | Free | Quick | Later | Verified live | Register only after your tool launches a genuine open repository for reusable privacy/security research outputs. | Repository must provide free no-login full text, at least five scholarly items, stable access, downloads and quality metadata; company catalogs are ineligible. | 2026-08-05 — https://opendoar.ac.uk/help/inclusion-criteria | Open OpenDOAR submit page (new tab)OpenDOAR details |
| 9 | 48 | OpenFeature Ecosystem | 45 | Link type unknown | openfeature.dev | Marketplaces and app stores | Free | Quick | Later | Verified live | Implement a genuine OpenFeature provider, hook or integration around an your tool configuration or audit-health use case, publish it and add it to the ecosystem documentation. | Must implement the OpenFeature contract and solve a credible feature-delivery problem; a nominal wrapper or backlink-only documentation pull request will not qualify. | 2026-08-05 | Open OpenFeature Ecosystem submit page (new tab)OpenFeature Ecosystem details |
| 10 | 48 | Stork.AI | — | Link type unknown | stork.ai | AI tool directories | Free | Quick | Later | Verified live | Submit your tool with the verification badge or use the no-badge paid option. | Free submission requires displaying the Stork Verified badge. | https://www.stork.ai/submit | Open Stork.AI submit page (new tab)Stork.AI details |
| 11 | 46 | Apache Camel Components | 90 | Nofollow | camel.apache.org | Marketplaces and app stores | Free | Moderate | Later | Verified live | Build a production-grade Camel component for your tool APIs and propose it upstream with generated component docs and tests. | Large ASF contribution: Java 21/Maven build, public dependencies, tests, docs, real contributor profile, AI attribution where relevant and community review required. | 2026-08-05 — https://camel.apache.org/camel-core/contributing/index.html | Open Apache Camel Components submit page (new tab)Apache Camel Components details |
| 12 | 46 | Astrophysics Source Code Library | 55 | Link type unknown | ascl.net | Software directories | Free | Moderate | Later | Verified live | Submit an your tool-related astronomy utility only after it has been used in research submitted to or published by a refereed journal. | Strict astronomy or astrophysics scope; code must be accessible, research-used, complete, moderated, and supported by a paper reference. | 2026-08-05 — https://ascl.net/code/submit | Open Astrophysics Source Code Library submit page (new tab)Astrophysics Source Code Library details |
| 13 | 46 | Bioconda | 50 | Link type unknown | bioconda.github.io | Developer registries | Free | Moderate | Later | Verified live | Create a tested Bioconda recipe for a genuinely biomedical or bioinformatics your tool utility, with accurate homepage/source metadata, and submit it through the official review workflow. | Strict life-science relevance is required; generic privacy or file tools do not qualify, and recipes must pass build, licence and dependency review. | 2026-08-05 | Open Bioconda submit page (new tab)Bioconda details |
| 14 | 46 | BioImage.IO | 40 | Link type unknown | bioimage.io | Communities and forums | Free | Moderate | Later | Verified live | Contribute a documented bioimaging privacy or de-identification model, application integration, or other qualifying resource linked to your tool. | Must genuinely serve bioimaging, follow the BioImage.IO resource specification and model card requirements, and pass community validation. | 2026-08-05 — https://bioimage.io/docs/ | Open BioImage.IO submit page (new tab)BioImage.IO details |
| 15 | 46 | CoMSES Computational Model Library | 50 | Link type unknown | comses.net | Review platforms | Free | Moderate | Later | Verified live | Publish a documented social, ecological, or computational model with source, narrative documentation, contributors, and reproducibility metadata. | Only genuine computational models qualify; optional peer review and DOI require stronger documentation and reproducibility. | Official CoMSES publishing guide and FAQ checked 2026-08-05 | Open CoMSES Computational Model Library submit page (new tab)CoMSES Computational Model Library details |
| 16 | 46 | CSDMS Model Repository | 90 | Link type unknown | csdms.colorado.edu | Software directories | Free | Moderate | Later | Verified live | Open-source a relevant geoscience model or component, complete the model questionnaire, and provide its code archive for CSDMS testing. | Must be an actual Earth-surface or geoscience model; staff may compile and run it, and BMI compatibility is encouraged. | Official CSDMS contribute-model guide checked 2026-08-05 | Open CSDMS Model Repository submit page (new tab)CSDMS Model Repository details |
| 17 | 46 | Cytoscape App Store | 55 | Link type unknown | apps.cytoscape.org | Marketplaces and app stores | Free | Moderate | Later | Verified live | Build a Cytoscape 3 app for a genuine graph privacy, provenance or network-audit workflow, provide website/source metadata and submit its first release for administrator approval. | Must add real Cytoscape functionality and remain compatible; the first release is manually approved and a generic external-link launcher is inappropriate. | 2026-08-05 | Open Cytoscape App Store submit page (new tab)Cytoscape App Store details |
| 18 | 46 | Debian Package Archive | 90 | Link type unknown | packages.debian.org | Developer registries | Free | Moderate | Later | Verified live | Create a policy-compliant Debian package for a stable useful your tool CLI, file the appropriate intent-to-package request, include accurate upstream metadata and secure a Debian sponsor for upload. | High-effort maintainership commitment: must be distributable, lintian-clean, reproducibly buildable and useful to Debian users; non-developers need sponsor review, and acceptance into NEW is not guaranteed. | 2026-08-05 | Open Debian Package Archive submit page (new tab)Debian Package Archive details |
| 19 | 46 | FreeBSD Ports Collection | 85 | Link type unknown | freebsd.org | Developer registries | Free | Moderate | Later | Verified live | Create and thoroughly test a FreeBSD port for a stable your tool CLI or desktop utility, include its canonical project website in WWW metadata and submit the patch through FreeBSD Bugzilla. | Anyone may submit, but the software must have a stable source release, acceptable licence, correct checksums/plist and clean builds; a volunteer maintainer is mandatory and review can take months. | 2026-08-05 | Open FreeBSD Ports Collection submit page (new tab)FreeBSD Ports Collection details |
| 20 | 46 | Galaxy ToolShed | 55 | Link type unknown | toolshed.g2.bx.psu.edu | Marketplaces and app stores | Free | Moderate | Later | Verified live | Build a tested Galaxy wrapper for an your tool medical-data privacy or de-identification workflow and publish it in the main ToolShed. | Only suitable for a functioning Galaxy utility; develop and test locally, follow Planemo and IUC practices, then create and upload a repository. | 2026-08-05 — https://galaxyproject.org/toolshed/ | Open Galaxy ToolShed submit page (new tab)Galaxy ToolShed details |
| 21 | 46 | ioBroker Adapters | 50 | Link type unknown | iobroker.net | Developer registries | Free | Moderate | Later | Verified live | Develop a stable ioBroker adapter for a credible your tool privacy/security API, publish the npm package, test it with users and request inclusion in the official latest repository. | Adapter must perform useful automation, pass repository checks and receive ongoing maintenance; do not build a dashboard that only links out to AltFTool. | 2026-08-05 | Open ioBroker Adapters submit page (new tab)ioBroker Adapters details |
| 22 | 46 | Lapce Volts Registry | 45 | Link type unknown | lapce.dev | Marketplaces and app stores | Free | Moderate | Later | Verified live | Build a WASI/LSP Volt that surfaces useful your tool diagnostics for HTML or SEO configuration files, then publish it with the official Volts CLI. | Official guide is older while the registry remains live; validate the current Volt SDK/runtime and review behavior before investment, and avoid a thin marketing launcher. | 2026-08-05 | Open Lapce Volts Registry submit page (new tab)Lapce Volts Registry details |
| 23 | 46 | Lite XL Plugin Repository | 40 | Link type unknown | lite-xl.com | Marketplaces and app stores | Free | Moderate | Later | Verified live | Create a Lua plugin with real commands for your tool URL audits or JSON validation and add a conforming manifest entry to the official Lite XL plugin repository. | Manifest must pin remote commits and checksums and pass repository review; the canonical outbound link may point to source, so a direct domain backlink is not guaranteed. | 2026-08-05 | Open Lite XL Plugin Repository submit page (new tab)Lite XL Plugin Repository details |
| 24 | 46 | NetBSD pkgsrc | 75 | Link type unknown | netbsd.org | Developer registries | Free | Moderate | Later | Verified live | Package a stable cross-platform your tool CLI for pkgsrc, test it with pkglint and supported builds, include the canonical homepage, then submit via pkgsrc-wip or NetBSD's package bug tracker. | Source package must compile and run correctly, follow pkgsrc policy and be maintained; non-developers use pkgsrc-wip or a formal package problem report, and inclusion is reviewed. | 2026-08-05 | Open NetBSD pkgsrc submit page (new tab)NetBSD pkgsrc details |
| 25 | 46 | nf-core | 50 | Link type unknown | nf-co.re | Review platforms | Free | Moderate | Later | Verified live | Propose and contribute a standards-compliant your tool-related bioinformatics privacy module, subworkflow, or full Nextflow pipeline. | Must solve a real bioinformatics need, avoid overlap, use nf-core templates, include tests and docs, pass linting, review, and maintenance expectations. | 2026-08-05 — https://nf-co.re/docs/contributing/overview | Open nf-core submit page (new tab)nf-core details |
| 26 | 46 | NWB NDX Catalog | 25 | Link type unknown | nwb-extensions.github.io | Marketplaces and app stores | Free | Moderate | Later | Verified live | Create a meaningful NWB extension for privacy, provenance, or consent metadata and submit its staged-extension YAML through an official pull request. | Must extend the NWB schema for a real neurodata use case with valid metadata, tests, maintainer details, and community approval. | Official NWB staged-extension and NDX catalog documentation checked 2026-08-05 | Open NWB NDX Catalog submit page (new tab)NWB NDX Catalog details |
| 27 | 46 | OpenEBench | 40 | Link type unknown | openebench.bsc.es | Software directories | Free | Moderate | Later | Verified live | Organize a rigorous life-science privacy-tool benchmark or participate with an eligible your tool method and publish validated results. | Requires a scientific community, formal challenge metadata, reference data, containerized metrics workflow, assigned role, and OpenEBench support review. | 2026-08-05 — https://openebench.readthedocs.io/en/latest/how_to/4_manage_events.html | Open OpenEBench submit page (new tab)OpenEBench details |
| 28 | 46 | openHAB Add-on Store | 65 | Link type unknown | openhab.org | Marketplaces and app stores | Free | Moderate | Later | Verified live | Build a real openHAB add-on that integrates an your tool home-network privacy or safety service, provide addon.xml, tests and documentation, then submit it upstream. | A genuine device or service integration is required; DCO, code quality, documentation and maintainer review apply, and marketing-only bindings are unsuitable. | 2026-08-05 | Open openHAB Add-on Store submit page (new tab)openHAB Add-on Store details |
| 29 | 46 | OpenWrt Packages | 75 | Link type unknown | openwrt.org | Developer registries | Free | Moderate | Later | Verified live | Build an OpenWrt-compatible your tool service or utility for a real router/privacy/security workflow, add correct package metadata and tests, then submit it to the official feed. | Only pursue functionality that genuinely runs on constrained routers or embedded systems; generic website wrappers and unsupported binaries are unsuitable. | 2026-08-05 | Open OpenWrt Packages submit page (new tab)OpenWrt Packages details |
| 30 | 46 | Preprints.org | 75 | Link type unknown | preprints.org | Other opportunities | Free | Moderate | Later | Verified live | Publish 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-authors | Open Preprints.org submit page (new tab)Preprints.org details |
| 31 | 46 | Promote Project | 35 | Link type unknown | promoteproject.com | Profiles and entities | Free | Moderate | Later | Verified live | Create a truthful your tool/founder profile or content page and add the website link where allowed. | Use a real brand/founder identity; do not create thin duplicate pages. Dofollow is reported but recheck after approval. | 2026-07-30 • https://www.submission.directory/site/promote-project | Open Promote Project submit page (new tab)Promote Project details |
| 32 | 46 | pyOpenSci | 45 | Link type unknown | pyopensci.org | Software directories | Free | Moderate | Later | Verified live | Submit a mature scientific Python package related to an your tool privacy or accessibility workflow for public review and listing. | Must support open science, have sustained public development, packaging, tests, docs, human-reviewed code, and a maintenance commitment. | 2026-08-05 — https://www.pyopensci.org/software-peer-review/our-process/policies.html | Open pyOpenSci submit page (new tab)pyOpenSci details |
| 33 | 46 | QIIME 2 Library | 50 | Link type unknown | library.qiime2.org | Marketplaces and app stores | Free | Moderate | Later | Verified live | Build and test a legitimate QIIME 2 plugin for a microbiome-data privacy, validation or provenance use case, then distribute it through the QIIME 2 Library. | Only credible microbiome or compatible data-science functionality qualifies; plugin APIs, packaging, testing and maintenance requirements apply. | 2026-08-05 | Open QIIME 2 Library submit page (new tab)QIIME 2 Library details |
| 34 | 46 | ReScience C | 35 | Link type unknown | rescience.github.io | Review platforms | Free | Moderate | Later | Verified live | Independently reproduce a published computational privacy or security result with open code and data, using your tool only where scientifically justified. | Must replicate existing research rigorously with a fully open stack; reviewers must reproduce the results before acceptance. | 2026-08-05 — https://rescience.github.io/write/ | Open ReScience C submit page (new tab)ReScience C details |
| 35 | 46 | ResearchBox | 30 | Link type unknown | researchbox.org | Other opportunities | Free | Moderate | Later | Verified live | Organize 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.php | Open ResearchBox submit page (new tab)ResearchBox details |
| 36 | 46 | rOpenSci | 70 | Link type unknown | ropensci.org | Software directories | Free | Moderate | Later | Verified live | If your tool produces a research-grade R package, submit a presubmission inquiry and the package for open review. | Package must fit rOpenSci scope, avoid overlap, meet testing and lifecycle policies, and remain actively maintained. | 2026-08-05 — https://devguide.ropensci.org/softwarereview_author.html | Open rOpenSci submit page (new tab)rOpenSci details |
| 37 | 46 | ROS Index | 70 | Link type unknown | index.ros.org | Software directories | Free | Moderate | Later | Verified live | Build a real ROS package for an your tool robotics/privacy/safety workflow, release it through rosdistro and expose maintained README, documentation and source links in ROS Index. | Must provide genuine ROS functionality and follow repository, metadata and release conventions; a branded launcher without robot-facing value will be rejected. | 2026-08-05 | Open ROS Index submit page (new tab)ROS Index details |
| 38 | 46 | SecretSearchEngineLabs | 50 | Link type unknown | secretsearchenginelabs.com | Business directories | Free | Moderate | Later | Verified live | Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools. | Human review may apply; use a natural brand title and avoid keyword stuffing. Listing link is currently reported nofollow. | 2026-07-30 • https://www.submission.directory/site/secretsearchenginelabs | Open SecretSearchEngineLabs submit page (new tab)SecretSearchEngineLabs details |
| 39 | 46 | Sellfy | 75 | Link type unknown | sellfy.com | Other opportunities | Free | Moderate | Later | Verified live | Publish 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 2026-08-07 | Open Sellfy submit page (new tab)Sellfy details |
| 40 | 46 | Sites Plus | — | Link type unknown | sites-plus.com | Business directories | Free | Moderate | Later | Verified live | Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools. | Human review may apply; use a natural brand title and avoid keyword stuffing. Dofollow is reported but recheck after approval. | 2026-07-30 • https://www.submission.directory/site/sites-plus | Open Sites Plus submit page (new tab)Sites Plus details |
| 41 | 46 | Startbase | 50 | Link type unknown | startbase.com | Startup directories | Free | Moderate | Later | Verified live | Register and claim a company profile only if your tool has a genuine German headquarters, branch or founding connection. | Conditional eligibility: innovative, scalable companies with a real Germany nexus, generally under ten years old; verification may require a company-domain email. | 2026-08-03 • https://www.startbase.com/faqs/ | Open Startbase submit page (new tab)Startbase details |
| 42 | 46 | Void Linux Packages | 60 | Link type unknown | voidlinux.org | Developer registries | Free | Moderate | Later | Verified live | Create a Void package template for a mature your tool CLI, test native and cross builds, include the canonical project homepage and submit it to void-packages. | Project must be mature, system-wide and maintainable; self-submission by upstream authors faces stricter usefulness and adoption scrutiny. | 2026-08-05 | Open Void Linux Packages submit page (new tab)Void Linux Packages details |
| 43 | 46 | WikiEducator | 55 | Link type unknown | wikieducator.org | Other opportunities | Free | Moderate | Later | Verified live | Author 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/educator | Open WikiEducator submit page (new tab)WikiEducator details |
| 44 | 46 | Zola Themes Gallery | 60 | Link type unknown | getzola.org | Design galleries | Free | Moderate | Later | Verified live | Create a polished accessible light/dark developer-documentation theme with an optional your tool pre-deploy audit example, then submit it to the official themes repository. | Must be a genuinely reusable high-quality theme, not a logo skin; theme metadata, homepage/demo, screenshot and a thorough README are required. | 2026-08-05 | Open Zola Themes Gallery submit page (new tab)Zola Themes Gallery details |
| 45 | 45 | Alignable | 75 | Nofollow | alignable.com | Business directories | Free + paid tier | Quick | Later | Verified live | Create an your tool business profile only if it genuinely operates in the United States or Canada and can be verified there. | Official rules limit membership to businesses located and operating in the US or Canada; not eligible for an India-only entity. | https://support.alignable.com/hc/en-us/articles/6422411508109-How-to-sign-up-for-Alignable | Open Alignable submit page (new tab)Alignable details |
| 46 | 45 | Lnk.Bio | 70 | Nofollow | lnk.bio | Profiles and entities | Free + paid tier | Quick | Later | Verified live | Build one your tool profile with a short description and curated links to the most useful tool pages. | Unlimited links are available, but avoid a bulk link dump; SEO value is not guaranteed. | 2026-08-04 | Open Lnk.Bio submit page (new tab)Lnk.Bio details |
| 47 | 45 | Solo.to | 60 | Nofollow | solo.to | Business directories | Free + paid tier | Quick | Later | Verified live | Create an your tool business page with concise brand details and links to the homepage, popular tools and socials. | Keep the page complete and user-focused; no duplicate thin profiles or SEO guarantee. | 2026-08-04 | Open Solo.to submit page (new tab)Solo.to details |
| 48 | 45 | UK Startup Hub | — | Link type unknown | ukstartuphub.com | Startup directories | Free + paid tier | Quick | Later | Verified live | Submit a concise company profile only if your tool is a genuine UK startup or has a verifiable UK operating entity. | UK relevance is required; the submit page does not promise automatic acceptance, publication timing or link attributes. | 2026-08-03 • https://ukstartuphub.com/submit | Open UK Startup Hub submit page (new tab)UK Startup Hub details |
| 49 | 45 | Yelp for Business | 95 | Nofollow | yelp.com | Business directories | Free + paid tier | Quick | Later | Verified live | Claim your tool’s genuine operating location only if the business is eligible, then add accurate website and contact information. | A real local or service-area business is required; an online-only tool with no eligible business presence may be rejected. | https://business.yelp.com/products/business-page/ | Open Yelp for Business submit page (new tab)Yelp for Business details |
| 50 | 43 | AnyFlip | 65 | Link type unknown | anyflip.com | Publishing platforms | Free + paid tier | Moderate | Later | Verified live | Upload an original useful your tool guide, complete its metadata and include relevant citations or resource links. | Only content AltFTool owns; avoid mass-uploaded, duplicate or promotional-only PDFs. | 2026-08-04 | Open AnyFlip submit page (new tab)AnyFlip details |
| 51 | 43 | Bio Sites | 70 | Nofollow | bio.site | Profiles and entities | Free + paid tier | Moderate | Later | Verified live | Create a free your tool Bio Site and organize homepage, tool-category and social links for real visitors. | Use accurate branding and a small curated link set; primarily referral/navigation value. | 2026-08-04 | Open Bio Sites submit page (new tab)Bio Sites details |
| 52 | 43 | ChamberofCommerce.com | 75 | Sometimes dofollow | chamberofcommerce.com | Business directories | Free + paid tier | Moderate | Later | Verified live | Add or claim your tool only if it has a genuine US business presence, then verify the website and business details. | US-focused local directory; eligibility, verification, and public-link treatment should be confirmed before submission. | https://www.chamberofcommerce.com/faq | Open ChamberofCommerce.com submit page (new tab)ChamberofCommerce.com details |
| 53 | 43 | Founded in UK | — | Link type unknown | foundeduk.com | Startup directories | Free + paid tier | Moderate | Later | Verified live | Use the 'Submit your British startup' application only if your tool was genuinely founded in the UK. | Eligibility is limited to ambitious UK-founded companies created in the 21st century; inclusion is curated and not guaranteed. | 2026-08-03 • https://foundeduk.com/ | Open Founded in UK submit page (new tab)Founded in UK details |
| 54 | 43 | Free AI Tools Directory | — | Link type unknown | free-ai-tools-directory.com | AI tool directories | Free | Involved | Later | Verified live | Submit your tool with homepage URL, privacy-first positioning, logo, screenshots and accurate pricing. | Accurate tool details required; editorial approval controls publication. Dofollow is reported but recheck after approval. | 2026-07-30 • https://www.submission.directory/site/free-ai-tools-directory | Open Free AI Tools Directory submit page (new tab)Free AI Tools Directory details |
| 55 | 43 | GainWeb | 20 | Dofollow | gainweb.org | Business directories | Free + paid tier | Moderate | Later | Verified live | Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools. | Human review may apply; use a natural brand title and avoid keyword stuffing. Dofollow is reported but recheck after approval. | 2026-07-30 • https://www.submission.directory/site/gainweb | Open GainWeb submit page (new tab)GainWeb details |
| 56 | 43 | Journal of Open Source Software | 60 | Link type unknown | joss.theoj.org | Software directories | Free | Involved | Later | Verified live | Submit a qualifying open your tool research-software component and short software paper after it has mature public development history. | Requires OSI licence, public source and issues, tests, documentation, research use, contributor authorship, and editorial review. | 2026-08-05 — https://joss.readthedocs.io/en/latest/submitting.html | Open Journal of Open Source Software submit page (new tab)Journal of Open Source Software details |
| 57 | 43 | LaunchBuff | — | Link type unknown | launchbuff.com | Launch platforms | Free + paid tier | Moderate | Later | Verified live | Use the free launch route and earn visibility through a genuine product submission. | Free links are nofollow; skip paid dofollow and reciprocal-badge options unless independently valuable. | 2026-08-05 official submit page | Open LaunchBuff submit page (new tab)LaunchBuff details |
| 58 | 43 | LaunchHive | — | Link type unknown | launchhive.io | Launch platforms | Free + paid tier | Moderate | Later | Verified live | Submit your tool through the free queue with accurate product details and assets. | Free review may take 3–8 weeks and link can be nofollow; skip paid or badge-based backlink shortcuts. | 2026-08-05 official submit page | Open LaunchHive submit page (new tab)LaunchHive details |
| 59 | 43 | NavTools AI | 25 | Link type unknown | navtools.ai | AI tool directories | Free + paid tier | Moderate | Later | Verified live | Submit your tool AI utilities and choose free review or paid placement. | Free review may take 30–90 days; all submissions are manually checked. | https://navtools.ai/submit | Open NavTools AI submit page (new tab)NavTools AI details |
| 60 | 43 | Nextdoor Business | 85 | Nofollow | nextdoor.com | Business directories | Free + paid tier | Moderate | Later | Verified live | Create a free page only for a genuine local your tool office or service area and add accurate story, categories, website, and contact data. | Official guidance says pages are for truly local businesses; verification is required for posting and online-only use is a poor fit. | https://business.nextdoor.com/en-us/blog/guide-to-claiming-your-nextdoor-business-page?hs_amp=true | Open Nextdoor Business submit page (new tab)Nextdoor Business details |
| 61 | 43 | NITRC | 55 | Link type unknown | nitrc.org | Software directories | Free + paid tier | Moderate | Later | Verified live | Register an actual neuroimaging privacy, quality-control, or data-processing tool through NITRC's resource workflow. | Must have substantive neuroimaging or neuroscience relevance; account registration and moderation apply. | Official NITRC project and registered-resource pages checked 2026-08-05 | Open NITRC submit page (new tab)NITRC details |
| 62 | 43 | ProLinkDirectory | 30 | Dofollow | prolinkdirectory.com | Business directories | Free + paid tier | Moderate | Later | Verified live | Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools. | Human review may apply; use a natural brand title and avoid keyword stuffing. Dofollow is reported but recheck after approval. | 2026-07-30 • https://www.submission.directory/site/prolinkdirectory | Open ProLinkDirectory submit page (new tab)ProLinkDirectory details |
| 63 | 43 | Qeios | 50 | Link type unknown | qeios.com | Review platforms | Free + paid tier | Moderate | Later | Verified live | Post a substantive study of privacy-preserving browser tools or redaction reliability with transparent methods and data. | Research only; promotional content is forbidden, conflicts are public, and DOI versions are permanent. Never buy Pro solely for a link. | 2026-08-05 — https://www.qeios.com/publishing-policy | Open Qeios submit page (new tab)Qeios details |
| 64 | 43 | Reach360 Launch | — | Link type unknown | reach360.app | Launch platforms | Free | Involved | Later | Verified live | Submit your tool as a genuine indie product and complete the requested launch information. | Small experimental platform; sign-in and editorial/ranking outcomes apply. | 2026-08-05 official submit page | Open Reach360 Launch submit page (new tab)Reach360 Launch details |
| 65 | 43 | ScienceOpen Preprints | 75 | Link type unknown | scienceopen.com | Publishing platforms | Free + paid tier | Moderate | Later | Verified live | Upload an unpublished evaluation study or research poster about an your tool privacy or accessibility method with supporting code and data. | Requires ORCID, integrity screening, complete authorship, one scholarly PDF, and CC BY licensing; records are permanent. | 2026-08-05 — https://www.scienceopen.com/collection/5916e67c-0edf-472a-ad8e-6e205a4e080d | Open ScienceOpen Preprints submit page (new tab)ScienceOpen Preprints details |
| 66 | 43 | SitePromotionDirectory | 25 | Link type unknown | sitepromotiondirectory.com | Business directories | Free + paid tier | Moderate | Later | Verified live | Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools. | Human review may apply; use a natural brand title and avoid keyword stuffing. Dofollow is reported but recheck after approval. | 2026-07-30 • https://www.submission.directory/site/sitepromotiondirectory | Open SitePromotionDirectory submit page (new tab)SitePromotionDirectory details |
| 67 | 43 | Solid Applications | 60 | Link type unknown | solidproject.org | Other opportunities | Free | Involved | Later | Verified live | Build 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 2026-08-05 | Open Solid Applications submit page (new tab)Solid Applications details |
| 68 | 43 | Startin.LV Startup Database | 35 | Link type unknown | startin.lv | Startup directories | Free + paid tier | Moderate | Later | Verified live | Apply only if the operating company is genuinely incorporated in Latvia and fits the database's scalable-startup criteria. | Conditional eligibility: Latvia-based incorporation and an innovative, scalable model; entries are manually considered rather than automatically published. | 2026-08-03 • https://startin.lv/startup-database/ | Open Startin.LV Startup Database submit page (new tab)Startin.LV Startup Database details |
| 69 | 43 | startup.ch | 45 | Link type unknown | startup.ch | Startup directories | Free + paid tier | Moderate | Later | Verified live | Apply for a profile only if your tool is operated by a scalable high-tech startup incorporated and headquartered in Switzerland. | Strict regional eligibility applies; the application requests company and team details and publication remains subject to review. | 2026-08-03 • https://www.startup.ch/index.cfm?page=137908 | Open startup.ch submit page (new tab)startup.ch details |
| 70 | 43 | Taplink | 75 | Nofollow | taplink.cc | Profiles and entities | Free + paid tier | Moderate | Later | Verified live | Create one branded Taplink page and add a curated set of your tool product, category and contact links. | Official signup is on taplink.at while public pages use taplink.cc; avoid repetitive link-only pages. | 2026-08-04 | Open Taplink submit page (new tab)Taplink details |
| 71 | 43 | TradeIndia | 75 | Nofollow | tradeindia.com | Business directories | Free + paid tier | Moderate | Later | Verified live | List a genuine paid your tool B2B product or service, complete the company profile, and provide accurate seller documentation. | Product, price, phone, company, and verification details are expected; do not use it as a generic SEO listing if the offer is ineligible. | https://www.tradeindia.com/about-us/help/account/registration/ | Open TradeIndia submit page (new tab)TradeIndia details |
| 72 | 43 | Trusted Introducer | 45 | Link type unknown | trusted-introducer.org | Developer registries | Free + paid tier | Moderate | Later | Verified live | List an operational CSIRT, CERT, SOC, ISAC or PSIRT after securing sponsors and passing the community-vote process. | Operational security team only; typical listing review and vote takes 4–5 weeks. | 2026-08-05 — https://www.trusted-introducer.org/trusted-introducer/processes/listing/ | Open Trusted Introducer submit page (new tab)Trusted Introducer details |
| 73 | 43 | WeekHack | — | Link type unknown | weekhack.com | Launch platforms | Free + paid tier | Moderate | Later | Verified live | Submit a real your tool release to the free weekly launch queue. | Free dofollow only for top three; long queue and one-year relaunch cooldown; avoid paying only for links. | 2026-08-05 official launches submit page | Open WeekHack submit page (new tab)WeekHack details |
| 74 | 42 | Foundation for Public Code | 45 | Link type unknown | publiccode.net | Other opportunities | Not stated | Moderate | Later | Verified live | If 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.html | Open Foundation for Public Code submit page (new tab)Foundation for Public Code details |
| 75 | 42 | UpRank | — | Link type unknown | uprank.com | Software directories | Not stated | Moderate | Later | Verified live | Submit your tool for manual inclusion in the software directory. | Manually vetted; acceptance and category fit are discretionary. | https://uprank.com/list-your-business | Open UpRank submit page (new tab)UpRank details |
| 76 | 42 | Zabbix Integration Partners | 75 | Link type unknown | zabbix.com | Marketplaces and app stores | Not stated | Moderate | Later | Verified live | Develop a maintained Zabbix template/integration for your tool and apply for Integration Partner review and Marketplace visibility. | Official partner path, not a free profile trick; requires a real supported integration, organizational review and an ongoing relationship with Zabbix. | 2026-08-05 — https://www.zabbix.com/partners | Open Zabbix Integration Partners submit page (new tab)Zabbix Integration Partners details |
| 77 | 39 | SaaSKart | — | Link type unknown | saaskart.co | Marketplaces and app stores | Not stated | Involved | Later | Verified live | Consider a verified vendor profile only if the India-focused buyer exposure justifies a recurring listing budget. | There is no free listing; the profile deactivates if the subscription is not renewed, and payment does not justify claiming editorial endorsement. | 2026-08-03 • https://www.saaskart.co/pricing | Open SaaSKart submit page (new tab)SaaSKart details |
| 78 | 38 | AIapps | 35 | Link type unknown | aiapps.com | AI tool directories | Paid | Quick | Later | Verified live | Consider only after your tool has a substantial AI feature and the directory offers business value beyond a link. | Paid annual listing; cancellation pauses the outbound link; do not buy solely for backlink value. | 2026-08-05 official submit page | Open AIapps submit page (new tab)AIapps details |
| 79 | 38 | EOSC Federation | 55 | Link type unknown | eosc.eu | Other opportunities | Paid | Quick | Later | Verified live | Onboard an operational research-facing your tool service through an eligible EOSC Node using the Federation Handbook process. | Organization-level service onboarding, not a directory form; maturity, policies, interoperability, support, and Node acceptance are required. | EOSC Federation Handbook checked 2026-08-05 | Open EOSC Federation submit page (new tab)EOSC Federation details |
| 80 | 38 | FIRST | 75 | Link type unknown | first.org | Other opportunities | Paid | Quick | Later | Verified live | Apply as Associate or full Member only after operating a credible incident-response team/program and completing sponsorship/review. | Full membership requires sponsors and SIM3/site-visit process; associate status needs a valid response mission and contribution value. | 2026-08-05 — https://www.first.org/membership/ | Open FIRST submit page (new tab)FIRST details |
| 81 | 36 | Agentic AI Foundation | — | Link type unknown | aaif.io | Other opportunities | Paid | Moderate | Later | Verified live | Apply 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 page | Open Agentic AI Foundation submit page (new tab)Agentic AI Foundation details |
| 82 | 36 | CiviCERT | 40 | Link type unknown | civicert.org | Other opportunities | Paid | Moderate | Later | Verified live | Apply 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 |
| 83 | 36 | Directory of Open Access Books | 70 | Link type unknown | doabooks.org | Other opportunities | Paid | Moderate | Later | Verified live | Apply 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-doab | Open Directory of Open Access Books submit page (new tab)Directory of Open Access Books details |
| 84 | 36 | LF AI & Data Foundation | 55 | Link type unknown | lfaidata.foundation | Other opportunities | Paid | Moderate | Later | Verified live | Join 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 page | Open LF AI & Data Foundation submit page (new tab)LF AI & Data Foundation details |
| 85 | 36 | OASIS Open | 80 | Link type unknown | oasis-open.org | Other opportunities | Paid | Moderate | Later | Verified live | Join 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 pages | Open OASIS Open submit page (new tab)OASIS Open details |
| 86 | 36 | Open Source Initiative | 85 | Link type unknown | opensource.org | Other opportunities | Paid | Moderate | Later | Verified live | After 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 document | Open Open Source Initiative submit page (new tab)Open Source Initiative 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.
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.
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.
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.
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 viewAn 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
Product launch sites87
One-shot launches where timing and preparation decide the outcome.
Guest posting sites55
Publications that accept contributed articles. Slow and editorial, but the links are earned.
AI tool directories200
Fast-growing listings specifically for AI-powered tools.
App stores and marketplaces273
Extension, plugin and integration stores. Real review processes, real distribution.
Startup directory submission sites120
Startup listings, beta lists and founder media.
Software directory submission sites215
General tool and software catalogues with real search traffic.
Software review sites29
B2B review sites. Slow to approve, strong once live.
Developer platforms for backlinks139
Package, image and docs hosting that carries real authority.
Web design galleries for backlinks87
Showcases judged on craft. A good screenshot matters more than copy.
Web 2.0 and publishing sites214
Write once, link back. Editorial standards vary widely.
PR and press release sites41
Get quoted or distribute a release. Slower, higher ceiling.
Business directory submission sites109
Company and local listings. Unglamorous, consistently indexed.
Profile creation sites163
Owned pages you control: company, founder, knowledge-panel entities.
Forum and community backlink sites61
Answer real questions. Never drop a bare link.
Social bookmarking sites18
Brand surface and referral traffic more than link equity.
More backlink opportunities153
Everything that does not fit the buckets above.
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.