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Clipstream* Java Streaming

Epresence

FFmpeg

FORscene Java video reviewing, logging, editing and publishing

FreeCast Java application which allows peer-to-peer stream broadcast.

FreeJ video streamer for Icecast

Helix Community

Icecast

IceShare P2P Icecast protocol

iRate a web radio that chooses the next song based on your previous ratings for other songs

Live555.com Live555.com Streaming Media Library

(LS)³ Libre Streaming, Libre Software, Libre Standards (formerly known as OMSP - Open Media Streaming Project)

MuSE audio mixing and streaming source software

MPEG-4

Ogg

Peercasting

P2P streaming The SplitStream Paper description.

phpStreamcast

QuickTime

QuickTime Broadcaster

RealSystem

SDP Multimedia -- Open Source project to save streaming media to disk

SHOUTcast

Streamcast

Unreal Media Server Live MPEG4/MP3 encoding; MPEG1/2/4, WMV, MP3, AVI files.

VideoLAN

Windows Media

Zina (Open-source alternative to Andromeda written in PHP)

GNU/Linux live CD ready for radio streaming

Xiph.org

Rivendell with the facilities for the acquisition, management, scheduling and playout of audio content.

PeerCast is a peer-to-peer broadcasting tool which allows you to broadcast without needing much upstream bandwidth.

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Comparison of streaming media systems Compares a few of these.

Streaming media

P2PTV Discusses some P2P TV streaming techniques.