We have Flotilla and Chachi, but they're still prototypes.
We're still stuck on Slack, which is really frustrating, but we hope to be able to self-host one of them when they mature.
Discussion
Been testing both these the past few months. Certainly lean toward Flotilla for UI but Chachi has expanded a lot lately and might be winning on UX. Still wish we bad more options though.
Been stuck most with relay moderation tools for non dev admins. I think if this could be bridged that would significantly help with transitioning groups from discord, slack, telegram etc onto nostr.