Janus is a general-purpose WebRTC media server and gateway written in C. It provides a modular architecture with a core daemon that dynamically loads plugins for various use cases (video conferencing, audio bridging, streaming, SIP, etc.), transports (HTTP, WebSockets, MQTT, RabbitMQ, Unix sockets), and event handlers. The server handles ICE/DTLS/SRTP for WebRTC peer connections, relays RTP/RTCP media between participants, and supports advanced features like simulcast, SVC, recording, and post-processing. A JavaScript client library (janus.js) is provided for browser integration. The system is production-grade, actively maintained, and widely deployed.
Jitsi Meet is an open-source video conferencing platform that provides real-time communication with features such as HD audio/video, screen sharing, chat, polls, breakout rooms, recording, live streaming, virtual backgrounds, and end-to-end encryption. The architecture is client-server: the web and mobile clients (React/React Native) communicate via XMPP (Prosody server) for signaling and WebRTC for media, with optional server-side components like Jitsi Videobridge and Jicofo for scalable conferencing. The codebase is organized into feature modules under `react/features/`, each with its own Redux actions, reducers, middleware, and platform-specific UI components (web vs. native). Key entry points include `app.js` for the web app, `react/index.native.js` for mobile, and native SDKs for iOS and Android. External dependencies include Prosody, Jitsi Videobridge, Jicofo, and various third-party services (Google, Microsoft, Dropbox, Amplitude). The project also includes server-side Prosody plugins (Lua) for authentication, room management, and monitoring, as well as a comprehensive test suite using WebDriverIO and custom load testing frameworks.