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A maintained list of 1,432 directories, launch platforms, registries and marketplaces that accept product submissions. 1,134 of them are free or have a free tier, and 192 are quick wins — free, low effort, and worth doing first. Every row shows cost, effort and priority, and links straight to the submission page.
The table is wider than the screen — swipe it sideways for cost, effort and the preparation notes.
| # | Impact (sorted) | Site — sort by this | Domain | Type | Cost | Effort — sort by this | Priority | Status | What to prepare | Rules / caveat | Checked | Actions |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 100 | Glama MCP Directory | glama.ai | Other opportunities | Free | Quick | Do first | Not submitted | Deploy a maintained your tool MCP server from GitHub, Docker, npm, or PyPI, verify maintainer ownership, and switch it public only after production testing. | Hosted servers are private by default; public listing requires a real working server, and ranking or backlink attributes remain platform-controlled. | 2026-08-03 | Open Glama MCP Directory submit page (new tab)Glama MCP Directory details |
| 2 | 100 | MERLOT | merlot.org | Other opportunities | Free | Quick | Do first | Verified live | Publish a genuinely reusable privacy or accessibility lesson on your tool, give it a stable URL and open license, then add its educational metadata to MERLOT. | The resource must be an online OER with its own URL; subscription-only material is inappropriate. Supply discipline, audience, material type, description, author, license, cost, and accessibility metadata honestly. | 2026-08-03 | Open MERLOT submit page (new tab)MERLOT details |
| 3 | 86 | Apache Airflow Ecosystem | airflow.apache.org | Other opportunities | Free | Quick | High | Verified live | Create a real your tool Airflow provider with hooks/operators and documentation metadata, publish it, then add it to Airflow’s Ecosystem page by PR. | Provider must implement apache_airflow_provider metadata, use unique connection types, be documented and packaged; ecosystem PR is evaluated for community usefulness. | 2026-08-05 — https://airflow.apache.org/docs/apache-airflow-providers/howto/create-custom-providers.html | Open Apache Airflow Ecosystem submit page (new tab)Apache Airflow Ecosystem details |
| 4 | 86 | APIList.fun | apilist.fun | Other opportunities | Free | Quick | High | Live, conditional | Recommend an official your tool API with its documentation URL, concise Markdown description, category, and technical details. | Submit only an active public API with accurate auth, SSL, request, and response information. | 2026-08-05 | Open APIList.fun submit page (new tab)APIList.fun details |
| 5 | 86 | APIs.guru OpenAPI Directory | apis.guru | Other opportunities | Free | Quick | High | Live, conditional | When your tool exposes a stable public API, host an official OpenAPI definition at a permanent URL and submit it with accurate ownership, category, logo, and metadata. | The API must be public through clearly documented access steps, persistent, independently useful, and described by a valid machine-readable definition. APIs.guru aggregates rather than hosts the specification and automatically rechecks its source, so keep the canonical spec stable and current. | 2026-08-03 | Open APIs.guru OpenAPI Directory submit page (new tab)APIs.guru OpenAPI Directory details |
| 6 | 86 | FOSSRadar | fossradar.dev | Other opportunities | Free | Quick | High | Verified live | After open-sourcing a maintained component, submit the TOML project file and website through GitHub PR. | Must be India-founded, India-maintained or serve Indian users; repository and license are required. | 2026-08-03 | Open FOSSRadar submit page (new tab)FOSSRadar details |
| 7 | 86 | Fourthwall | fourthwall.com | Other opportunities | Free | Quick | High | Verified live | Offer a substantial free privacy checklist, accessibility workbook, or safety template from a branded storefront and link your tool only as supporting documentation. | Publish useful rights-cleared products rather than thin promotional downloads; payment rates vary and the free plan has listing limits. | Official Fourthwall digital-products, pricing, and terms pages checked 2026-08-07 | Open Fourthwall submit page (new tab)Fourthwall details |
| 8 | 86 | Global Accessibility Awareness Day | accessibility.day | Other opportunities | Free | Quick | High | Verified live | Host a genuine public accessibility learning or testing event and submit its dates, description and your tool event URL. | The event must be real and accessibility-focused; use a public event page, not a disguised product listing. | 2026-08-05 — https://accessibility.day/submit-your-event | Open Global Accessibility Awareness Day submit page (new tab)Global Accessibility Awareness Day details |
| 9 | 86 | Goodpods | goodpods.com | Other opportunities | Free | Quick | High | Live, conditional | Search for and claim a real your tool podcast, then keep its RSS-supplied website and episode metadata accurate. | Claim only a show AltFTool owns; authentic podcast content and RSS ownership are required. | 2026-08-04 | Open Goodpods submit page (new tab)Goodpods details |
| 10 | 86 | HSTS Preload List | hstspreload.org | Other opportunities | Free | Quick | High | Not submitted | Audit every your tool subdomain, stage HSTS safely, then submit the base domain only after long-term HTTPS readiness is proven. | Requires a valid certificate, HTTP-to-HTTPS redirect, HTTPS on every subdomain, and HSTS max-age of at least one year with includeSubDomains and preload. Inclusion is difficult and slow to undo, so do not submit before a staged rollout. | 2026-08-03 | Open HSTS Preload List submit page (new tab)HSTS Preload List details |
| 11 | 86 | Listen Notes | listennotes.com | Other opportunities | Free | Quick | High | Live, conditional | Submit a real your tool podcast RSS feed whose show website and episode notes naturally reference relevant tools. | Valid human-made podcast with substantive episodes only; low-quality or link-only feeds are rejected. | 2026-08-04 | Open Listen Notes submit page (new tab)Listen Notes details |
| 12 | 86 | OpenChain | openchainproject.org | Other opportunities | Free | Quick | High | Verified live | Implement a scoped open-source compliance or security-assurance program, self-certify honestly, then request your tool Community of Conformance listing. | Every applicable answer must truthfully be yes and scope must be explicit; self-certification is not independent certification or endorsement. | 2026-08-05 official conformance submission, FAQ and Community of Conformance pages | Open OpenChain submit page (new tab)OpenChain details |
| 13 | 86 | Player FM | player.fm | Other opportunities | Free | Quick | High | Live, conditional | Submit a genuine your tool podcast RSS feed or Apple Podcasts URL with accurate show-website and episode metadata. | Feed must be public, accessible and contain playable audio enclosures; do not submit a fake link-only feed. | 2026-08-04 | Open Player FM submit page (new tab)Player FM details |
| 14 | 86 | Pocket Casts | pocketcasts.com | Other opportunities | Free | Quick | High | Live, conditional | Submit a real public your tool podcast RSS feed whose metadata and episode notes reference the official site naturally. | Requires a valid public RSS feed and genuine episodes; do not submit a shell or private feed as public. | 2026-08-05 | Open Pocket Casts submit page (new tab)Pocket Casts details |
| 15 | 86 | PulseMCP | pulsemcp.com | Other opportunities | Free | Quick | High | Live, conditional | Submit your tool MCP repository or public server URL, preferably after publishing it to the official MCP Registry. | Registry data is processed periodically; only submit a real repository, server or client. | 2026-08-04 | Open PulseMCP submit page (new tab)PulseMCP details |
| 16 | 86 | PWA Directory | pwa.directory | Other opportunities | Free | Quick | High | Live, conditional | First pass PWA checks, then submit the installable HTTPS app with manifest, service worker, offline behavior, icons, and screenshots. | Requires a valid manifest, registered service worker, useful offline behavior, HTTPS, no broken links, and more than a bare website wrapper. | 2026-08-03 | Open PWA Directory submit page (new tab)PWA Directory details |
| 17 | 86 | Sensu Bonsai | bonsai.sensu.io | Other opportunities | Free | Quick | High | Verified live | Publish an open-source Sensu check/handler for your tool, create GitHub releases and bonsai.yml, then register it with description and tags. | GitHub-hosted open-source asset; release archives, supported platforms, SHA-512 checksums, useful README and correct Bonsai metadata are required. | 2026-08-05 — https://docs.sensu.io/sensu-go/latest/plugins/assets/#share-an-asset-on-bonsai | Open Sensu Bonsai submit page (new tab)Sensu Bonsai details |
| 18 | 86 | StackStorm Exchange | exchange.stackstorm.org | Other opportunities | Free | Quick | High | Verified live | Create a useful StackStorm integration or automation pack for an your tool workflow, then submit it through the official Exchange Incubator pull-request process. | Pack must contain real actions, workflows, rules or sensors; pack.yaml metadata must pass naming, email, Python and SemVer checks, and contribution grants the documented copyright licence. | 2026-08-05 | Open StackStorm Exchange submit page (new tab)StackStorm Exchange details |
| 19 | 68 | itch.io | itch.io | Other opportunities | Free | Quick | Medium | Live, conditional | Publish a genuine browser or desktop your tool utility with screenshots, documentation and an official-site link. | Content must be an actual downloadable or browser-run project and follow itch.io quality/content rules; not a generic directory listing. | https://itch.io/developers | Open itch.io submit page (new tab)itch.io details |
| 20 | 68 | Participedia | participedia.net | Other opportunities | Free | Quick | Medium | Verified live | Document a real participatory public-decision deployment as a Case, Method or Organization entry with evaluations and project URL. | Community knowledge base, not a product directory; cite credible sources and show genuine participation outcomes. | 2026-08-05 — https://participedia.net/getting-started | Open Participedia submit page (new tab)Participedia details |
| 21 | 68 | ProcessWire Modules Directory | processwire.com | Other opportunities | Free | Quick | Medium | Verified live | Build a ProcessWire admin module for external URL, metadata, accessibility or security audits, register as a module author and submit it to the official directory. | Author login required; avoid duplicating existing SEO modules and provide a specific external-audit workflow with maintained source, documentation and support. | 2026-08-05 | Open ProcessWire Modules Directory submit page (new tab)ProcessWire Modules Directory details |
| 22 | 68 | PublicAPIs.io | publicapis.io | Other opportunities | Free | Quick | Medium | Live, conditional | List a legitimate documented your tool API in the relevant developer category using the normal or Pro review queue. | API must be real and documented; paid placement should be disclosed and does not guarantee organic ranking value. | 2026-08-05 | Open PublicAPIs.io submit page (new tab)PublicAPIs.io details |
| 23 | 68 | SciCrunch RRID Resource Portal | scicrunch.org | Other opportunities | Free | Quick | Medium | Verified live | Register a stable, genuinely research-used your tool software, service, or database with accurate maintainer and version metadata. | Must be a persistent research resource; acceptance or identifier assignment is curated and not intended for promotional listings. | 2026-08-05 — https://scicrunch.org/resources/about/resource?form=Resource&rel=26 | Open SciCrunch RRID Resource Portal submit page (new tab)SciCrunch RRID Resource Portal details |
Behind the list
Every row here starts as a line in a sheet, gets normalised into one of 15 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.
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.