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
All filters3
Filtered byModerate to submit— remove this filterLater— remove this filterVerified live— remove this filterClear all

1–40 of 63 opportunities

Long tailimpact 46–43

  • Apache Camel Components

    camel.apache.org

    Build a production-grade Camel component for your tool APIs and propose it upstream with generated component docs and tests.

    Estimated domain authority DA ~90NofollowFreeModerateVerified liveIntegration Framework
    SubmitApache Camel Components (opens in a new tab)

  • Astrophysics Source Code Library

    ascl.net

    Submit your -related astronomy utility only after it has been used in research submitted to or published by a refereed journal.

    Estimated domain authority DA ~55FreeModerateVerified liveAstronomy Software
    SubmitAstrophysics Source Code Library (opens in a new tab)

  • Bioconda

    bioconda.github.io

    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.

    Estimated domain authority DA ~50FreeModerateVerified liveScientific Package Ecosystem
    SubmitBioconda (opens in a new tab)

  • BioImage.IO

    bioimage.io

    Contribute a documented bioimaging privacy or de-identification model, application integration, or other qualifying resource linked to your tool.

    Estimated domain authority DA ~40FreeModerateVerified liveBioimaging AI
    SubmitBioImage.IO (opens in a new tab)

  • CoMSES Computational Model Library

    comses.net

    Publish a documented social, ecological, or computational model with source, narrative documentation, contributors, and reproducibility metadata.

    Estimated domain authority DA ~50FreeModerateVerified liveComputational Research
    SubmitCoMSES Computational Model Library (opens in a new tab)

  • CSDMS Model Repository

    csdms.colorado.edu

    Open-source a relevant geoscience model or component, complete the model questionnaire, and provide its code archive for CSDMS testing.

    Estimated domain authority DA ~90FreeModerateVerified liveGeoscience Software
    SubmitCSDMS Model Repository (opens in a new tab)

  • Cytoscape App Store

    apps.cytoscape.org

    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.

    Estimated domain authority DA ~55FreeModerateVerified liveScientific Plugin Ecosystem
    SubmitCytoscape App Store (opens in a new tab)

  • Debian Package Archive

    packages.debian.org

    Create a policy-compliant Debian package for your stable useful CLI, file the appropriate intent-to-package request, include accurate upstream metadata and secure a Debian sponsor for upload.

    Estimated domain authority DA ~90FreeModerateVerified liveOS Package Ecosystem
    SubmitDebian Package Archive (opens in a new tab)

  • FreeBSD Ports Collection

    freebsd.org

    Create and thoroughly test a FreeBSD port for your stable CLI or desktop utility, include its canonical project website in WWW metadata and submit the patch through FreeBSD Bugzilla.

    Estimated domain authority DA ~85FreeModerateVerified liveOS Package Ecosystem
    SubmitFreeBSD Ports Collection (opens in a new tab)

  • Galaxy ToolShed

    toolshed.g2.bx.psu.edu

    Build a tested Galaxy wrapper for your medical-data privacy or de-identification workflow and publish it in the main ToolShed.

    Estimated domain authority DA ~55FreeModerateVerified liveLife-Science Tools
    SubmitGalaxy ToolShed (opens in a new tab)

  • ioBroker Adapters

    iobroker.net

    Develop a stable ioBroker adapter for your credible privacy/security API, publish the npm package, test it with users and request inclusion in the official latest repository.

    Estimated domain authority DA ~50FreeModerateVerified liveHome Automation Ecosystem
    SubmitioBroker Adapters (opens in a new tab)

  • Lapce Volts Registry

    lapce.dev

    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.

    Estimated domain authority DA ~45FreeModerateVerified liveCode Editor
    SubmitLapce Volts Registry (opens in a new tab)

  • Lite XL Plugin Repository

    lite-xl.com

    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.

    Estimated domain authority DA ~40FreeModerateVerified liveCode Editor
    SubmitLite XL Plugin Repository (opens in a new tab)

  • NetBSD pkgsrc

    netbsd.org

    Package your stable cross-platform 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.

    Estimated domain authority DA ~75FreeModerateVerified liveOS Package Ecosystem
    SubmitNetBSD pkgsrc (opens in a new tab)

  • nf-core

    nf-co.re

    Propose and contribute your standards-compliant -related bioinformatics privacy module, subworkflow, or full Nextflow pipeline.

    Estimated domain authority DA ~50FreeModerateVerified liveBioinformatics Workflows
    Submitnf-core (opens in a new tab)

  • NWB NDX Catalog

    nwb-extensions.github.io

    Create a meaningful NWB extension for privacy, provenance, or consent metadata and submit its staged-extension YAML through an official pull request.

    Estimated domain authority DA ~25FreeModerateVerified liveNeurodata Standards
    SubmitNWB NDX Catalog (opens in a new tab)

  • OpenEBench

    openebench.bsc.es

    Organize a rigorous life-science privacy-tool benchmark or participate with your eligible method and publish validated results.

    Estimated domain authority DA ~40FreeModerateVerified liveScientific Benchmarking
    SubmitOpenEBench (opens in a new tab)

  • openHAB Add-on Store

    openhab.org

    Build a real openHAB add-on that integrates your home-network privacy or safety service, provide addon.xml, tests and documentation, then submit it upstream.

    Estimated domain authority DA ~65FreeModerateVerified liveHome Automation Ecosystem
    SubmitopenHAB Add-on Store (opens in a new tab)

  • OpenWrt Packages

    openwrt.org

    Build your OpenWrt-compatible service or utility for a real router/privacy/security workflow, add correct package metadata and tests, then submit it to the official feed.

    Estimated domain authority DA ~75FreeModerateVerified liveOS Package Ecosystem
    SubmitOpenWrt Packages (opens in a new tab)

  • Preprints.org

    preprints.org

    Publish an original benchmark or evaluation study of local-first privacy or security tooling with open code, data, and your tool implementation.

    Estimated domain authority DA ~75FreeModerateVerified livePreprints
    SubmitPreprints.org (opens in a new tab)

  • Promote Project

    promoteproject.com

    Create your truthful /founder profile or content page and add the website link where allowed.

    Estimated domain authority DA ~35FreeModerateVerified liveProfile / entity
    SubmitPromote Project (opens in a new tab)

  • pyOpenSci

    pyopensci.org

    Submit a mature scientific Python package related to your privacy or accessibility workflow for public review and listing.

    Estimated domain authority DA ~45FreeModerateVerified liveResearch Software Review
    SubmitpyOpenSci (opens in a new tab)

  • QIIME 2 Library

    library.qiime2.org

    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.

    Estimated domain authority DA ~50FreeModerateVerified liveScientific Plugin Ecosystem
    SubmitQIIME 2 Library (opens in a new tab)

  • ReScience C

    rescience.github.io

    Independently reproduce a published computational privacy or security result with open code and data, using your tool only where scientifically justified.

    Estimated domain authority DA ~35FreeModerateVerified liveReproducibility Journal
    SubmitReScience C (opens in a new tab)

  • ResearchBox

    researchbox.org

    Organize the complete code, data, materials, and outputs behind your real evaluation study into a public citable box.

    Estimated domain authority DA ~30FreeModerateVerified liveResearch Artifacts
    SubmitResearchBox (opens in a new tab)

  • rOpenSci

    ropensci.org

    If your tool produces a research-grade R package, submit a presubmission inquiry and the package for open review.

    Estimated domain authority DA ~70FreeModerateVerified liveResearch Software Review
    SubmitrOpenSci (opens in a new tab)

  • ROS Index

    index.ros.org

    Build a real ROS package for your robotics/privacy/safety workflow, release it through rosdistro and expose maintained README, documentation and source links in ROS Index.

    Estimated domain authority DA ~70FreeModerateVerified liveRobotics Software Ecosystem
    SubmitROS Index (opens in a new tab)

  • SecretSearchEngineLabs

    secretsearchenginelabs.com

    Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools.

    Estimated domain authority DA ~50FreeModerateVerified liveWeb / business directory
    SubmitSecretSearchEngineLabs (opens in a new tab)

  • Sellfy

    sellfy.com

    Publish your substantive privacy template, workbook, or creator resource with a complete description, original previews, and accurate licensing.

    Estimated domain authority DA ~75FreeModerateVerified liveCreator Storefront
    SubmitSellfy (opens in a new tab)

  • Sites Plus

    sites-plus.com

    Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools.

    FreeModerateVerified liveWeb / business directory
    SubmitSites Plus (opens in a new tab)

  • Startbase

    startbase.com

    Register and claim a company profile only if your tool has a genuine German headquarters, branch or founding connection.

    Estimated domain authority DA ~50FreeModerateVerified liveRegional startup directory
    SubmitStartbase (opens in a new tab)

  • Void Linux Packages

    voidlinux.org

    Create a Void package template for your mature CLI, test native and cross builds, include the canonical project homepage and submit it to void-packages.

    Estimated domain authority DA ~60FreeModerateVerified liveOS Package Ecosystem
    SubmitVoid Linux Packages (opens in a new tab)

  • WikiEducator

    wikieducator.org

    Author a freely licensed hands-on module for safe document sharing or privacy-first web use with relevant your tool examples.

    Estimated domain authority DA ~55FreeModerateVerified liveOER / Education
    SubmitWikiEducator (opens in a new tab)

  • Zola Themes Gallery

    getzola.org

    Create a polished accessible light/dark developer-documentation theme with your optional pre-deploy audit example, then submit it to the official themes repository.

    Estimated domain authority DA ~60FreeModerateVerified liveStatic-site Generator
    SubmitZola Themes Gallery (opens in a new tab)

  • AnyFlip

    anyflip.com

    Upload your original useful guide, complete its metadata and include relevant citations or resource links.

    Estimated domain authority DA ~65Free + paid tierModerateVerified liveDocument Publishing
    SubmitAnyFlip (opens in a new tab)

  • Bio Sites

    bio.site

    Create your free Bio Site and organize homepage, tool-category and social links for real visitors.

    Estimated domain authority DA ~70NofollowFree + paid tierModerateVerified liveCreator Profile / Link Hub
    SubmitBio Sites (opens in a new tab)

  • ChamberofCommerce.com

    chamberofcommerce.com

    Add or claim your tool only if it has a genuine US business presence, then verify the website and business details.

    Estimated domain authority DA ~75Sometimes dofollowFree + paid tierModerateVerified liveLocal / Business Listing
    SubmitChamberofCommerce.com (opens in a new tab)

  • Founded in UK

    foundeduk.com

    Use the 'Submit your British startup' application only if your tool was genuinely founded in the UK.

    Free + paid tierModerateVerified liveRegional startup directory
    SubmitFounded in UK (opens in a new tab)

  • GainWeb

    gainweb.org

    Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools.

    Estimated domain authority DA ~20DofollowFree + paid tierModerateVerified liveWeb / business directory
    SubmitGainWeb (opens in a new tab)

  • LaunchBuff

    launchbuff.com

    Use the free launch route and earn visibility through a genuine product submission.

    Free + paid tierModerateVerified liveLaunch Directory
    SubmitLaunchBuff (opens in a new tab)

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

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.