Light QX Protocol is as lightweight E2EE irc-like network for private messaging.

Layered E2EE group-messaging protocol stack built on MLS (RFC 9420). Includes GBP base layer, GTP/GAP/GSP sub-protocols, SFrame media encryption, and cross-platform bindings for Rust, .NET, Node.js and Python.

xteam IM - 企业级加密办公聊天软件。支持团队架构、话题驱动、消息同步、音视频通话。多重加密，聊天记录可随时删除。全端支持（PC/Web/Android/iOS），线上成熟运营4-5年。

A purely Python, End-to-End Encrypted (E2EE) chat system. Features ECDH key exchange, AES-GCM encryption, and forward secrecy.

Self-hosted E2EE messenger stack with web client, API, encrypted chats, groups, files, WebRTC calls and SFU.

Quasar Secure is a real-time messaging application designed under the principles of Zero Trust.

ThunderLight — приватный мессенджер со сквозным шифрованием (E2EE). Исходный код безопасного клиента

Artos E2EE Messenger

A trustless, anonymous E2EE messenger written in Rust. Security by inability, not by good faith.

A modern, privacy-respecting IRC client for terminal

The self-hosted, decentralized data node for Normsar Sovereign Messaging. Deploy your own Silo to achieve true data sovereignty and connect securely to the Normsar Hub.

SylvaCrypt [Formerly ShadowCrypt]: E2E Encrypted Messaging Platform with Zero-Knowledge Relays.

Sovereign messaging: end-to-end encrypted, serverless, and functional on & off the grid.

A sovereign, zero-knowledge private communication platform for couples. Features Signal-grade E2EE, WebRTC calls, and a self-hosted backend.

Tor Chat is built so anyone can stand up their own private chat on the Tor network — no cloud account, no clearnet bind. Guests open your .onion in Tor Browser; messages are encrypted in the browser with WebCrypto before they reach the host, so ChatServer is only a blind SignalR relay that stores ciphertext.

Signal protocol for Expo / React Native