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. The SHOUTcast software uses a client_server model, with each component communicating via a network protocol that intermingles audio or video data with metadata such as song titles and the station name. It uses HTTP as a transport protocol. Although multicast was planned, it was never developed. SHOUTcast servers and clients are available for FreeBSD, Linux, Mac OS X, Microsoft Windows, and Solaris.
Contributions by Mjb, AndrewMrse, and AbsolutDan.