Open Source #messaging Projects

A free and open source instant messaging and VoIP chat app for friends, groups, and communities.

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.

Simple, open source team messaging platform

Self-hosted chat server with voice, video, text, and screen sharing — Discord-like features on your own infrastructure.

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.