One of the first genuinely good FTP games on Steam, thousands of players on one map at once. Fight the battle to win the war.

Better than the first one, the story is a bit out there but playing with friends is definitely the way to go in this loot-based sci-fi shooter.

Play dress-up during the zombie apocalypse and craft insane weapons. Tons of fun for two players in campaign coop.

Best with a controller and 4 people, couch coop only but boy is it fun! Physics based royal rumble punch-em-up, can you stay inside the arena?

Incredibly unique turn-by-turn fighting game where you contract and extend individual muscles to perform moves. Hard at first but worth the time.

Fun little indie game with cute coop and some interesting game mechanics. It also looks beautiful.

If you can get passed the learning curve this is an addictive MOBA that's tons of fun with friends and truly FTP if you aren't interested in skins.

Another great FTP title, some pay to play here but still a lot of fun. There aren't too many good online arcade flight games so don't be so picky!

Roll back the clock and visit the 90's with the FTP version of a classic, still as much fun as ever but we miss the regenerating health ;)

Free mod that allows for the crazy physics of JC2 to be enjoyed online with other players. JC2 is often only a few bucks on Steam so you might as well!