Team Fortress 2

24 player no-crits TF2.
Regular group events.

Minecraft

(Survival Multiplayer Alpha)
A game in which you build things.

Alien Swarm

Multiple Steam group servers.
Custom maps added by request.

Left 4 Dead 2

All game modes plus bonus difficulty mod. Custom maps supported.

Hardware

Find out what's keeping all this nonsense running.

Mumble

High-quality, low-latency voice chat you can use for anything.