Is there a plugin repository to browse?
Looks like not all plugins available in nodebb admin are compatible / working.
So a repository with plugins and compatible nodebb version info would be nice.
The plugin repository is the one in nodebb admin. But the thing about it is that there is no moderation there - it's just npm packages that have nbbpm attribute and compatibility string. If the compatibility string is wrong, there is no way for NodeBB to verify that. You can learn about it here.
Other than that you can just search GitHub, NPM and GitLab for names starting with