Half Life 2
Qtracker Server Browser (v4.4)
If you've ever played a multiplayer game on your PC, the in-game server browser has probably left you wanting more. Qtracker lets you say goodbye to the in-game browser, forever! From the convenience of one program you can manage all of the games
This external server browser program that allows you to browse for Source games servers (and many other games) without launching the game itself.