Wowza - Streaming media server supporting all known streaming protocols.
Kurento - Kurento is an open source software development framework providing a media server written in C/C++...
MistServer - MistServer is a lightweight, open-source multistandard multimedia server.
Red5 - Red5 is an open source Flash media server for live streaming solutions of all kinds.
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.
Nimble Streamer - Light-weight media server that is freemium, pay for control panel if you need it.