Flumotion!

MediaGoblin is a free software media publishing platform that anyone can run. You can think of it as a decentralized alternative to Flickr, YouTube, SoundCloud, etc.

YouPHPTube! is an video-sharing website.

Red5 is an open source Flash media server for live streaming solutions of all kinds.It is written in Java that supports

MistServer is a lightweight, open-source multistandard multimedia server. It bridges the gap between lightweight webservers and the usually heavyweight mediaservers that support non-HTTP protocols.

Streaming media server supporting all known streaming protocols.

Kurento Media Server provides, out of the box, group communications, mixing, transcoding, recording and playing. In addition, it also provides advanced modules for media processing including computer vision, augmented reality, alpha blending and much more.

A powerful and versatile multi-format video streaming server capable of real-time transcoding, dynamic media format adaptation, and live video distribution to a variety of user devices.

GMediaServer serves audio and video files to certain network connected media players. Most hardware media players only play music and/or video—they don't provide the media themselves. Those media files have to come from a device on the network.

The Adobe® Flash® Media Server family of products has become the industry-leading solution for streaming video and real-time communication. The ubiquity of the Adobe Flash Platform provides a rich viewing experience across virtually all operating systems and screens through integration with the Adobe Flash Player runtime, adopted on 98% of computer screens worldwide.

Smooth Streaming, an IIS Media Services extension, enables adaptive streaming of media to Silverlight and other clients over HTTP. Smooth Streaming provides a high-quality viewing experience that scales massively on content distribution networks, making true HD 1080p media experiences a reality.

Mammoth is an Open Source c++ Flash Server software that enables you to stream, video and audio on the web. Has built-in support for all possible flash codecs (thank you ffmpeg!) h264, sorenson, speex, ... and streams through rtmp, rtmpe, rtmpt.

Flussonic is a great scalable Media Server that is a cost effective alternative to Wowza Media Server and Adobe Flash Media Server . It was specifically designed to stream HDS/HLS/HTTP.

The LIVE555 Media Server is a complete RTSP server application.