5 days 21 hours
70 days 10 hours
15 days 4 hours
Team Fortress 2
4 days 8 hours
Can confirm Fistful of Frags is great fun. Adding to the list: the new Unreal Tournament, No More Room In Hell, Halo Online (search for it on reddit, it's basically Halo 3 on PC).
I've never tried: Brawlhalla, Tribes: Ascend, Dirty Bomb or Loadout
try dirty bomb i have spent 1k ours its the best f2p game with out op weapons just pure skill the micro transactions are just pure cosmetic or to unlock new mercs which you can still get them with in game money that you earn for playing and doing missions try it out