MapMixer is designed to give you more control over the way you launch and manage your game session in Unreal Tournament 3. It replaces the the game's Main Menu and let's you launch either a quick-offline match or a complete session where every map is specifically customised - or randomised. It's a whole new way to manage your UT3 experience.
This is a minor full release version containing some bug fixes from the 3.01 release. I've had this version kicking around for a few years. The announcement of the new UT game jogged my memory.