Media delivery platform for streaming multimedia productions. Supports RTSP/RTP delivery of AVI, WAV, MP3, and MOV files, as well as RTSP delivery of RealAudio and RealVideo [Server, Proxy, and SDK; source available] https://www.helixcommunity.org
Open Mash supports the Mash streaming media toolkit and distributed collaboration applications based on the Internet Mbone tools and protocols. [Client, includes source] http://www.openmash.org
MPEG-4/ISMA interoperability suite produced by Cisco. Supports MPEG-4 Audio (aac), MPEG-4 Video, RTP, RTSP, MP3 (using RFC 2250). Includes client, server (Darwin), and encoding tools. [Client and Server, includes source] http://mpeg4ip.sourceforge.net
The Vovida Open Communication Application Library (VOCAL) is an open source project targeted at facilitating the adoption of VoIP in the marketplace. The Vovida implementation of RTSP includes an RTSP stack and server with playing and recording capabiliti http://www.vovida.org/applications/downloads/vocal/
RTSP/RTP implementation for multimedia systems researchers who want to investigate protocols and operating systems issues [Server, Client, Proxy; includes source] http://komssys.sourceforge.net/html/index.html