It’s called Airtime 2.1 and it’s open source, free to download, but only runs on Ubuntu Linux and Debian Squeeze. But, once installed you can interact with it through any web browser.
This new version of Airtime 2.1 now features real-time show editing and live stream rebroadcasting, audio library improvements, and a playout history log.
“Live stream rebroadcasting allows remote broadcasters to connect to Airtime via tools such as Mixxx or Virtual DJ. Airtime will rebroadcast the stream, either at a set-time, or in the middle of an existing broadcast with a smooth transition,” according to a news release.
Airtime 2.1 can be downloaded free.
For a preview, visit this YouTube page.
Source: About.com

