Your favorite F2P?

Streets of Rage Remake, just plain free.

TF2.

APB when the servers aren't being complete shit (rarely).

Probably SWTOR or Unturned. TF2 is pretty good too.

Combat Arms EU (not in Steam)

Fistful of Frags. Not f2p, but completely free.

Dota 2 and Neotokyo.

maplestory

Hearthstone

Path of Exile hands down.

League of Legends

My fav was TF2, but for today they adding too much shits and i stopped playing in 2013.

Path of Exile and then League of Legends (although I haven't played the latter for ages now).

Scarlet Blade

Warframe, the recent updates are kinda boring though.

TF2.

Team Hatress 2

Path of Exile for me

Fistful of Frags.

Smite (not on steam). basically a 3rd person moba for those unfamiliar :D

Dota 2

I play LoL, but if on Steam, my fave would be Fistful of Frags, it's FREE :o

Now, it's Unturned.

TERA: Rising.