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.

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

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

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

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

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

Artos E2EE Messenger

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.

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

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

An E2EE Multiplatfrom Messaging App Built on Laravel and Sanctum API for the mobile app version

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.

E2E-encrypted messenger as a PWA. X3DH + Double Ratchet, Argon2id vault with device binding, zero-knowledge relay. Built against governmental mass surveillance.

Signal protocol for Expo / React Native