Open Source #messaging Projects

Instant messaging platform with self-hosted backend in Go and clients for iOS, Android, web, and command line.

Open-source team chat with a unique topic-based threading model that makes it easy to follow multiple conversations.

Simple, open source team messaging platform

Open-source Matrix client for secure, decentralized messaging, voice, and video — runs on your own server.

Decentralized private messenger using email infrastructure for secure, end-to-end encrypted communication.