Infrastructure for Frappe applications

Guys, I’ve been searching throughout the forum, but couldn’t figure out.

Is there any documentation about Frappe applications infrastructure? What is the process to submit application to the main repository?
Looking at Frappe Apps it seems to be a standalone catalog, rather than apps repo integrated with Frappe. Well, at least in our official SaaS instance App Installer doesn’t show Civil Contracting, EU Base VAT Integration for ERPNext, Jasper Report Integration and Amazon S3 Backup applications.

Just thought it would be nice to have an integrated repository with community applications and easy way to submit them.

Addition: Fleet app is not discoverable via App installer as well.

There is no formal system. Maybe share it here?