Qtracker is described as 'Internet/LAN game and MP3 server browser. If you want to find places to play your favorite games, look no further'. There are seven alternatives to Qtracker for a variety of platforms, including the Web, Windows, Mac, Linux and Self-Hosted solutions. The best alternative is GameTracker, which is free. Other great apps like Qtracker are aGSM (Free), HLSW Fixes (Free), Exophase (Free) and 333networks MasterServer (Free, Open Source).