Combat Arms

Combat Arms is a 3D FPS and i am happy to say that it's one of the best FPS i had ever played, if you're in love with FPS games than this means you will love Combat Arms, earn level in rank, money to buy new weapons and gear, fight with other players of fight against the computer in order to complete missions, or survive zombie attacks.
Choose you're caracter gender and appearance and then you are ready to kick some ass, you start with an average gun and some money, the bad part is that the guns aren't permanent so don't waste money to buy weapons and just use 2-3.
Even tough the the games i very old Nexon keep's updating the game, and that's no doubt since it's one of the most popular and played FPS, below you'll see some mods.

Mods:

Elimination : Team death match.
Search and Destroy : One is planting the c4 and the other team need to defuse it
One Man Army : Free for all.
Capture The Flag : Try to capture the other teams flag...i deer you
Spy Hunt : Players attempt to acquire all 3 ‘intel cases’ to become the super spy with access to powerful weapons.

Quarantine :  Play as either humans or Infected.

Fireteam : Play cooperatively in multi-staged missions.
Seize and Secure : King of the hill style game. Whichever team can capture and hold a location for a certain amount of time wins.

Visit www.gamersofhell.ucoz.com for the download and to see the cons and pro about this game.