FiveTaco 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
HUNT0 publishes a catalog of startups and software that founders can still join.
Letter List publishes a catalog of startups and software that founders can still join.
Mr. Free Tools publishes a catalog of startups and software that founders can still join.
NoteableAI publishes a catalog of startups and software that founders can still join.
OneMillionDirectory publishes a catalog of startups and software that founders can still join.
Open Startup publishes a catalog of startups and software that founders can still join.
Post Make publishes a catalog of startups and software that founders can still join.
SaaS Projects publishes a catalog of startups and software that founders can still join.
Small Business Marketing Tools publishes a catalog of startups and software that founders can still join.
Startup Beat publishes a catalog of startups and software that founders can still join.
Startup Resources publishes a catalog of startups and software that founders can still join.
StartupTile publishes a catalog of startups and software that founders can still join.
Startup World publishes a catalog of startups and software that founders can still join.
Stellar Launch publishes a catalog of startups and software that founders can still join.
Submissions Web Directory publishes a catalog of startups and software that founders can still join.
Tech Faster publishes a catalog of startups and software that founders can still join.
Tool Finder publishes a catalog of startups and software that founders can still join.
NewAIForYou is a catalog of AI products: you can list a tool there, and people browse what already exists.
ailib.ru publishes a catalog of startups and software that founders can still join.
AIxuanfeng publishes a catalog of startups and software that founders can still join.
Startups.fyi publishes a catalog of startups and software that founders can still join.
Appolicious publishes a catalog of startups and software that founders can still join.
Insur-Tech iPhone Life 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.