GameTracker - GameTracker is your one-stop social network for gamers with game server stats, website plugins, and...
Music For Makers - Licensing good music has never been this easy.
ServerBrowser.com - Online game server browser
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
BattleMetrics - Game Server monitor and tracker
Incompetech - Royalty Free and Creative Commons Music Archive