Brownbook publishes a catalog of startups and software that founders can still join.
Directories with a public submission form
These sites take a URL through a form rather than a public profile or a guest article.
1010 destinations
AI Tools Directory is a catalog of AI products: you can list a tool there, and people browse what already exists.
ExactSeek.com publishes a catalog of startups and software that founders can still join.
Slash Dot publishes a catalog of startups and software that founders can still join.
Callupcontact publishes a catalog of startups and software that founders can still join.
Webrazzi publishes a catalog of startups and software that founders can still join.
magicbox.tools is a catalog of AI products: you can list a tool there, and people browse what already exists.
Software Suggest collects software profiles and comparisons for people choosing a tool.
Slate publishes a catalog of startups and software that founders can still join.
SubmitAiTools publishes a catalog of startups and software that founders can still join.
TinyLaunch publishes a catalog of startups and software that founders can still join.
AppExchange publishes a catalog of startups and software that founders can still join.
neeed.directory publishes a catalog of startups and software that founders can still join.
Digg publishes a catalog of startups and software that founders can still join.
HotVsNot.Com publishes a catalog of startups and software that founders can still join.
Starter Story publishes a catalog of startups and software that founders can still join.
Pipedrive Marketplace publishes a catalog of startups and software that founders can still join.
Aura++ publishes a catalog of startups and software that founders can still join.
Shopify App Store
shopify.com
Shopify App Store publishes a catalog of startups and software that founders can still join.
Stripe App Marketplace publishes a catalog of startups and software that founders can still join.
Listly publishes a catalog of startups and software that founders can still join.
India Mart publishes a catalog of startups and software that founders can still join.
PitchBook publishes a catalog of startups and software that founders can still join.
Programmable Web publishes a catalog of startups and software that founders can still join.
When a submission form is the right door
A form is the usual path for product directories: you send a URL, a short description, and often a logo. Approval is not automatic, and the link can be dofollow or nofollow.