Fluxer

Fluxer is a free and open source instant messaging and VoIP chat app built for friends, groups, and communities, with text channels, voice and video chat, and screen sharing in a Discord-style server layout. It ships native apps for Windows, macOS, Linux, Android, and iOS alongside a web client, and the same server can be fully self-hosted with Docker Compose for complete control over your data. Self-hosted instances support real-time messaging, watch parties, and community discovery just like the hosted service.