Very fun game developing "simulator"! WARNING: May take hours of your life away because it is so addicting.

The third game in the ArmA franchise. Very well made. A lot of servers/gamemodes to choose from and very fun once you get used to all of the controls.

Realistic military simulator. Has it's ups and downs like the server list being down, but fun overall once you get the ips to servers and play.

Many planes to choose from and the recently added "Tanks"! Could take time to master, but when you get used to it, the game can be really fun!

Amazing survival game. Can be buggy at times, but the amazing graphics and gameplay make up for it, aswell as the setting.

Very realistic, many gamemodes, etc. Here's the latest version of Counter-Strike. Don't expect to be able to run-and-gun easily. GL. -Dynamic

From the ArmA II and III mod, here is DayZ. It's still in it's alpha phases, don't expect anything that's cutting edge. But it's still good. Try it.