Resources for consideration of media servers.

Real Helix server for streaming media.  Deliver RealAudio, RealVideo, Windows Media, QuickTime , MP3, MPEG-4, 3GPP* (H.263 and H.264) and more from one server infrastructure. Runs on linux, windows or solaris.  Provides authentication services.  Also integrated production and capture services available too.

Apple's open source streaming media server.  Provides mpeg-4, 3gpp, and quicktime formats.  Can be built and run on Mac OSX, Redhat Linux, Solaris 9, and Win2003 servers.

Open source and commercial software solutions for webcasting video, audio & synchronized presentation media with navigation.  This is a one to many broadcasting system.  Supports mpeg-4, windows media, real media and quicktime formats.