Toolify.ai is a catalog of AI products: you can list a tool there, and people browse what already exists.
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
Tarkle publishes a catalog of startups and software that founders can still join.
Software Advice collects software profiles and comparisons for people choosing a tool.
DevHunt publishes a catalog of startups and software that founders can still join.
FinancesOnline collects software profiles and comparisons for people choosing a tool.
Startup Stash publishes a catalog of startups and software that founders can still join.
Croz Desk collects software profiles and comparisons for people choosing a tool.
Launched by Lovable publishes a catalog of startups and software that founders can still join.
PeerPush publishes a catalog of startups and software that founders can still join.
The Verge publishes a catalog of startups and software that founders can still join.
SideProjectors publishes a catalog of startups and software that founders can still join.
Buzzfeed News publishes a catalog of startups and software that founders can still join.
Active Search Results publishes a catalog of startups and software that founders can still join.
Webwiki publishes a catalog of startups and software that founders can still join.
BetaPage publishes a catalog of startups and software that founders can still join.
Launching Next publishes a catalog of startups and software that founders can still join.
Fast Company publishes a catalog of startups and software that founders can still join.
PC Mag publishes a catalog of startups and software that founders can still join.
ZDNet publishes a catalog of startups and software that founders can still join.
SaaSWorthy collects software profiles and comparisons for people choosing a tool.
ARS Technica publishes a catalog of startups and software that founders can still join.
Dev Post publishes a catalog of startups and software that founders can still join.
Geek Wire publishes a catalog of startups and software that founders can still join.
Yelp 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.