Gamespy
Qtracker v.4 92
Qtracker supports over 100 of the most popular multiplayer games, and is actively supported with regular updates If you've ever played a multiplayer game on your PC, the in-game server browser has probably left you wanting more.
RV House v.0.93.4
RV House is intended to give Re-Volt players an online meeting place where races can be easily hosted and joined.
AGSM v.2 52
GSM is alternative Game Server Monitor, a new way to quickly find and monitor (display real-time status) multiplayer game servers for many popular online games.
GameQ - PHP Game Server Status Library v.1.12
A PHP 5 library for querying game servers.