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A maintained list of 1,854 legitimate backlink sites: directories, profile creation sites, guest posting sites, launch platforms, registries and marketplaces. 1,532 are free or have a free tier, 44 usually give a dofollow link, and 772 have an estimated DA of 70 or more. Every row shows authority, link type, cost and effort, and links straight to the submit page.
Implement a genuine OpenFeature provider, hook or integration around your configuration or audit-health use case, publish it and add it to the ecosystem documentation.
Build a production-grade Camel component for your tool APIs and propose it upstream with generated component docs and tests.
Submit your -related astronomy utility only after it has been used in research submitted to or published by a refereed journal.
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.
Contribute a documented bioimaging privacy or de-identification model, application integration, or other qualifying resource linked to your tool.
Publish a documented social, ecological, or computational model with source, narrative documentation, contributors, and reproducibility metadata.
Open-source a relevant geoscience model or component, complete the model questionnaire, and provide its code archive for CSDMS testing.
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.
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.
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.
Build a tested Galaxy wrapper for your medical-data privacy or de-identification workflow and publish it in the main ToolShed.
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.
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.
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.
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.
Propose and contribute your standards-compliant -related bioinformatics privacy module, subworkflow, or full Nextflow pipeline.
Organize a rigorous life-science privacy-tool benchmark or participate with your eligible method and publish validated results.
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.
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.
Publish an original benchmark or evaluation study of local-first privacy or security tooling with open code, data, and your tool implementation.
Create your truthful /founder profile or content page and add the website link where allowed.
Submit a mature scientific Python package related to your privacy or accessibility workflow for public review and listing.
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.
Independently reproduce a published computational privacy or security result with open code and data, using your tool only where scientifically justified.
Organize the complete code, data, materials, and outputs behind your real evaluation study into a public citable box.
If your tool produces a research-grade R package, submit a presubmission inquiry and the package for open review.
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.
Submit your tool (or its blog/feed where required) under productivity, privacy or developer tools.
Publish your substantive privacy template, workbook, or creator resource with a complete description, original previews, and accurate licensing.
Register and claim a company profile only if your tool has a genuine German headquarters, branch or founding connection.
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.
Author a freely licensed hands-on module for safe document sharing or privacy-first web use with relevant your tool examples.
Create a polished accessible light/dark developer-documentation theme with your optional pre-deploy audit example, then submit it to the official themes repository.
Create your business profile only if it genuinely operates in the United States or Canada and can be verified there.
Build one your tool profile with a short description and curated links to the most useful tool pages.
Create your business page with concise brand details and links to the homepage, popular tools and socials.
Claim your tool’s genuine operating location only if the business is eligible, then add accurate website and contact information.
Upload your original useful guide, complete its metadata and include relevant citations or resource links.
Create your free Bio Site and organize homepage, tool-category and social links for real visitors.
Add or claim your tool only if it has a genuine US business presence, then verify the website and business details.
Four steps that work for a new site, a SaaS or a side project. No paid link packages, nothing that risks a penalty.
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.
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.
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.
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
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.
One-shot launches where timing and preparation decide the outcome.
Publications that accept contributed articles. Slow and editorial, but the links are earned.
Fast-growing listings specifically for AI-powered tools.
Extension, plugin and integration stores. Real review processes, real distribution.
Startup listings, beta lists and founder media.
General tool and software catalogues with real search traffic.
B2B review sites. Slow to approve, strong once live.
Package, image and docs hosting that carries real authority.
Showcases judged on craft. A good screenshot matters more than copy.
Write once, link back. Editorial standards vary widely.
Get quoted or distribute a release. Slower, higher ceiling.
Company and local listings. Unglamorous, consistently indexed.
Owned pages you control: company, founder, knowledge-panel entities.
Answer real questions. Never drop a bare link.
Brand surface and referral traffic more than link equity.
Everything that does not fit the buckets above.