Sorry for the late response, I don't usually check nostr during the weekend.

For what's ready right now, it depends on what community you're trying to build, for a discord like experience @chachi is the furthest along.

For a signal-like chatroom experience keychat seems to be doing really well.

Zapchat is still in development (please correct me if I'm wrong nostr:nprofile1qyt8wumn8ghj7etyv4hzumn0wd68ytnvv9hxgtcpzemhxue69uhku6t9dshxummnw3erztnrdakj7qpq49p5act9a5qm9p47elp8w8h3wpwn2d7s2xecw2ygnrxqp4wgsklq3hga3p).

Eve is a bit behind on features as of right now, but it will eventually be the best tool for any community. In npub1yy9wdef5us8af5q3zl3fs5usndygl3wge7xj5qkk5mtq2g4swwhs9ls23g , we currently support invite-only communities with forum functionality, at the moment, but more is coming soon 😉