www.sauerbraten.org
They finally implemented full .md5 and normal-map support on playermodels in the latest CVS version (undocumented so far, but there is almost always someone to help in their irc channel).
I remember this was the biggest reason why people didn't like using the engine.
Oh and as always their mapediting right
IN the engine could hardly be easier.
Make some games
P.S.: If you have some great .md5/Doom3/Quake4 PPM rotting on your hard-drive they would probably love to implement it in their game, as right now the md5 content (!) is pretty much non existant.