hypedesk.io 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
Visit → publishes a catalog of startups and software that founders can still join.
Indie Bites publishes a catalog of startups and software that founders can still join.
Indie Page publishes a catalog of startups and software that founders can still join.
indietools.app publishes a catalog of startups and software that founders can still join.
Jakob Greenfeld publishes a catalog of startups and software that founders can still join.
Visit → publishes a catalog of startups and software that founders can still join.
KnowEm publishes a catalog of startups and software that founders can still join.
launch-list.org publishes a catalog of startups and software that founders can still join.
Let Us Submit For You - $299 publishes a catalog of startups and software that founders can still join.
Pieter Levels publishes a catalog of startups and software that founders can still join.
Life Hacker DA: 92 publishes a catalog of startups and software that founders can still join.
Linkbazaar publishes a catalog of startups and software that founders can still join.
listingbott.com publishes a catalog of startups and software that founders can still join.
loganix.com publishes a catalog of startups and software that founders can still join.
Marketing Examples publishes a catalog of startups and software that founders can still join.
Medsci publishes a catalog of startups and software that founders can still join.
My First Million publishes a catalog of startups and software that founders can still join.
MicroConf Connect publishes a catalog of startups and software that founders can still join.
MicroFounder publishes a catalog of startups and software that founders can still join.
MicroSaaS Ideas / MicroSaaS.io publishes a catalog of startups and software that founders can still join.
The Mom Test - Rob Fitzpatrick publishes a catalog of startups and software that founders can still join.
Next AI Tool (Featured) is a catalog of AI products: you can list a tool there, and people browse what already exists.
No Code MVP - Bram Kanstein 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.