Shoutcast
Nullsoft's Free Winamp-based distributed streaming audio system. Anyone can broadcast music through this cutting edge streaming technology. Site features online documentation, downloads, news, and station showcase.

Mp3Spy
Aids in the finding/selecting/getting feeds from Shoutcast servers to your MP3 player

Icecast
Open source broadcast system based on the MP3 streaming audio format. Site includes information on downloading the server application and participating in its development, as well as a directory of current icecast broadcasts.

Oddsock.org
Freeware plug-in and software site focused on improving online broadcasting with a handy collection of free tools.

Clipstream
New streaming solution for webmasters.

RMS WaveCast
Broadcast automation software; allows you to store, organise, schedule and broadcast your music. Shareware version available for download.

MuSE
Open source server engine with the ability to mix, encode, and stream sound dynamically. Can optionally support Ogg Vorbis input, and can send streaming sound to an IceCast server. Site describes the features with screenshots.

StreamRipper
Records Shoutcast and Live365 MP3 streams to a hard disk, creating separate files for each track. Runs under Unix and Windows.

ShoutGrab
Java application which saves an audio stream from any ShoutCast server to your hard drive as an MP3 file.

Andromeda Streaming Jukebox
PHP/ASP script giving a web server the ability to manage, serve, browse, and stream collections of MP3s and other files. Free trial version available.