Nullsoft SHOUTcast Server will accept connections via SHOUTcast DSP Plug-in in order to have a SOURCE Stream to broadcast. Once a stream has begun, the server will only accept connections from other copies of Winamp in order to broadcast that source stream to each listener. In effect, having a micro-broadcast system to allow people to be able to broadcast any content in any of the formats that Winamp supports. Through the use of specialized broadcasting plug-ins, audio from a microphone as well as any device attached to the Line-In port on the broadcasters soundcard can be streamed via SHOUTcast Server.

You can also download the Linux and FreeBSD builds of SHOUTcast.

Download Nullsoft SHOUTcast WIN32 Console/GUI Server 1.9.2
Homepage : SHOUTCast
Source : FileForum