Willem

it's based on mastodon as far as I know, so it will show a community per user where only the community owner can post.

I'm not sure about replies though...

Try Obtainium, it gives can give update notifications for apps installed from github.

Same here, only when Google referred me to a post I've looked at it, I hope that the trove of issues&fixes that's currently there starts up and gets indexed on Lemmy soon!