
Opentape describes itself as "a free, open-source package that lets you make and host your own mixtapes on the web." Or, in other words, a Muxtape clone that's free and open source.
The demo mixtape is basically a straight up clone of the Muxtape site. The software uses PHP 5, Apache, and requires curl. The version 0.1 release hit the web a couple of days ago.
Get more at SitePoint.