SHOUTcast
SHOUTcast is cross-platform proprietary software for streaming media over the Internet. The software, developed by Nullsoft (purchased by AOL on June 1, 1999), allows digital audio content, primarily in MP3 or HE-AAC format, to be broadcast to and from media player software, enabling the creation of Internet radio "stations". SHOUTcast Radio is a related website which provides a directory of SHOUTcast stations.
Read more about Shoutcast.