...
- Forums: https://forum.neverwintervault.org/ - lacks real time chat
- IRC - text only, bit of a barrier for keeping history, less features
- matrix/element - https://element.io/en - chat based
- Zulip - https://zulip.com/ - free for open source projects or can be self hosted
Things that would be useful:
- Histories
- Threads
- Image/file uploads
- DMs
- Moderation tools
- Easy to access
- Bots for some functions