What are your favorite multiplayer games to play on PC?

I've been having the most fun with Trine 2, Don't Starve Together and Project Zomboid. Also still playing Mass Effect 3 with a good group of friends.

I've been playing Unturned for a while now.

Dota 2 has been a staple for many years, but I've also enjoyed Torchlight II, Path of Exile, Borderlands and Command & Conquer 3.

Planetside 2 (Even though I stopped playing it two years ago), and Counter Strike 1.6(I stopped playing it as well, because it's dead :'( )

Town of Salem

Counterstrike and CoD World at War

Black Ops 3

Insurgency is great, GTA:Online with friends is good fun, except when the online system fucks up.

That poison called Dota 2.

I play too much CS

Chivalry Medieval Warfare
Battlefield 3-4
Cs 1.6
Half life
Will Rock

FORCED, but my friends hate me for making them play it :(

I've been into Battlefield 4 and warframe lately altough warframe just eats my time.

day of defeat source

PayDay 2
Warface
Insurgency
SpeedRunners
Just Cause 2 Multiplayer mod

Vindictus. ;3

Tf2

Smite

Been playing hot pursuit loads of fun.