The original full-platform IM communication layer framework
A New Kind of Instant Messaging
Powerful open source team chat application
Home to the Signal Protocol and other cryptographic primitives
A free (libre) open source, mobile OS for Ethereum
bluetooth mesh chat, IRC vibes
Encrypted messaging, communities, voice chat, and file sharing.
Smoke: Android Crypto Chat Messenger
ChatSecure is a free and open source encrypted chat client for iOS
Self-hosted chat app for small teams