Growth Junkie 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
Insanely Cool Tools publishes a catalog of startups and software that founders can still join.
Startup Guys publishes a catalog of startups and software that founders can still join.
Tools NoCode publishes a catalog of startups and software that founders can still join.
WhatTheAI publishes a catalog of startups and software that founders can still join.
AI Depot is a catalog of AI products: you can list a tool there, and people browse what already exists.
startuplist.ing publishes a catalog of startups and software that founders can still join.
Best of Web publishes a catalog of startups and software that founders can still join.
toolfolio publishes a catalog of startups and software that founders can still join.
Ant Directory publishes a catalog of startups and software that founders can still join.
Daily Pings publishes a catalog of startups and software that founders can still join.
Text Link Directory publishes a catalog of startups and software that founders can still join.
American Startups publishes a catalog of startups and software that founders can still join.
Startup Inspire publishes a catalog of startups and software that founders can still join.
Lachief.io is a catalog of AI products: you can list a tool there, and people browse what already exists.
App Spy publishes a catalog of startups and software that founders can still join.
Best App for Kids publishes a catalog of startups and software that founders can still join.
Cabinet publishes a catalog of startups and software that founders can still join.
MacTrast publishes a catalog of startups and software that founders can still join.
Online Genuises publishes a catalog of startups and software that founders can still join.
Startup Tracker publishes a catalog of startups and software that founders can still join.
AffordHunt publishes a catalog of startups and software that founders can still join.
Crazy About Startups publishes a catalog of startups and software that founders can still join.
Discover Our Town 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.