Spacebar is a free, opensource selfhostable discord-compatible chat, voice and video platform.
- Discord-compatible (Use all your custom clients/bots with minimal changes)
- Selfhostable (Server)
- Open Source (GitHub Organization)
- Configurable (Configure every aspect and limits to your needs)
- Decentralized (no abuse of power and doesn’t have a single point of failure)
- Extendable (secure and cross-platform plugin system)
- Themeable (cross-platform theme system with design editor)
- Secure (publicly audited and hosted FOSS software for transparent foundation in terms of security)
Revolt is kinda “centralized”. You can host your own version, but they seem to actively discourage you from doing so.