Darwin Streaming Server
- Apple's open source streaming server and proxy. Supports RTSP/RTP serving of MOV files. [Server and Proxy, includes source]
- http://developer.apple.com/opensource/server/streaming/

IBM RTSP Toolkit
- IBM's toolkit is based on tools developed for video and other applications in 1995-1996. Their toolkit reflects the Unix philosophy of shells, processes and generic tools, and demonstrate a shell-based implementation of the protocol and its usefulness for
- http://researchweb.watson.ibm.com/rtsptoolkit/

Vovida RTSP Stack
- 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/

Helix
- 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://helixcommunity.org/

Komssys
- 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

RTSP Monitor
- Tool to check the availability of time-based media files and real-time media streams. Written in Java utilizing JMF.
- http://demo.freshwater.com/SiteScope/docs/RTSPMonitor.htm

Sun Java Media Framework
- SDK for adding streaming media to Java applications and applets. [Client SDK]
- http://java.sun.com/products/java-media/jmf/

Columbia University rtspd
- Supports serving of .au files via RTSP/RTP for Windows NT and Solaris [Server, source available]
- http://www.cs.columbia.edu/IRT/software/rtspd

Cisco IP/TV
- Video server and viewer which implements RTSP, RTP, H.261, and MPEG video. [Client and Server]
- http://www.cisco.com/iptv

Open Mash
- 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

RealPlayer
- RealNetworks cross-platform multimedia player. Supports RTSP/RTP with H.261, u-Law, a-law, MP3, DVI. [Client]
- http://www.real.com/player

QuickTime
- Apple's multi-platform multimedia software architecture. Supports RTSP/RTP with H.261, H.263, MPEG 1 Video, Layer 1 and 2 Audio, DVI, mu-Law, a-Law and others. [Client, includes source]
- http://www.apple.com/quicktime

MPEG4IP
- 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