ONCE Campfire is described as 'Campfire is an installable, self-hosted group chat system. Easily invite people. Make rooms. @mentions, DMs, and mobile support. The basics done right. And since you get the code and host it yourself, you can customize it however you’d like for your own use' and is a instant messenger in the social & communications category. There are more than 50 alternatives to ONCE Campfire for a variety of platforms, including Android, Web-based, Mac, Windows and iPhone apps. The best ONCE Campfire alternative is Element. It's not free, so if you're looking for a free alternative, you could try Element or Discord. Other great apps like ONCE Campfire are Slack, Stoat Chat, Wire and Threema.
Dirc is a peer-to-peer web application which uses WebRTC to set up connections between chat participants without requiring a back-end server. The static files can be self-hosted. Other features:
