I have one running at master.maverickservers.com for Quake 3 engine based games. This includes Quake 3, JK2, JKA, RTCW, and ET

You can use this master server with your game server by doing the following in your config:
set sv_master2 "master.maverickservers.com"

You can also view the current list of Quake 3 1.32 servers here:
http://www.maverickservers.com/MasterSe ... rotocol=68

If the game protocol your game isn't 68 feel free to change it in the above url and use that. If anyone has any questions just let me know.