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.

Resources for consideration of media servers.

ePresence Interactive Media software is a content capturing, archiving, and webcasting system that delivers video and presentation media over the internet using multiple streaming formats for multiple platforms. ePresence also supports text and voice interaction among event participants.

ePresence Interactive Media consists of ePresence Media and ePresence Live!.
ePresence Media is open source software that supports media capture, archiving, and archive access.
Members of the ePresence Open Source Consortium have a choice of two support service packages and also receive ePresence Live! code which supports real-time streaming.

Helix server for over 50 media types