MapMixer is a Mutator for Unreal Tournament 2004 that gives you extended control over your game by helping to manage the options that maps are invoked with. It allows you to easily personalise settings for each map, including Game Type, Mutators, Player Counts and Bot Skill. MapMixer provides it's own map list system which includes the ability to handle game types on a per map basis. Think of it as a configurable extension to the way you use UT2004 in either single player or network games with server and client support.
MapMixer is not a voting system - it provides a way of easily managing elements of the game for people playing on their own or admins setting up network games. If used in combination with voting systems, MapMixer is designed to allow these other external systems to invoke map changes.
The mutator started off as a small project to incorporate list shuffling and map list navigation into UT2003 but as time went by it evolved to incorporate a much larger range of administrative facilities. When UT2004 was released, MapMixer was overhauled and converted for the new game.
Finally sinx has released the official version (v2.00) of this great little utility. He's worked damn hard on this and I love this utility to bits.