FFmpeg - Open source multimedia suite for conversion, playback, profiling, and streaming.
Kurento - Kurento is an open source software development framework providing a media server written in C/C++...
Xvid - Xvid is an open-source research project focusing on video compression and is a collaborative...
Ant Media Server - Scalable, Ultra Low Latency & Adaptive WebRTC Streaming Ant Media Server provides Scalable Ultra-low latency (0.5 seconds) Adaptive Live Streaming with WebRTC. It supports RTMP, RTSP, Zixi, WebRTC, Adaptive Bitrate, HLS and MP4 recording.
FLAC - A free, open source codec for lossless audio compression and decompression
Red5 - Red5 is an open source Flash media server for live streaming solutions of all kinds.