Good games to play with friends

You can play Arma 3, great game in coop

league , cs source or battlefield 4^^

I recommend Dungeon Defenders. Great adventure to four players.
Also, some time ago established coop modification to Return to Castle Wolfenstein.

Space Engineers, The Hunter(last version)

Pretty much everything by Nintendo ^^
Maybe Factorio if you like Sandbox or League of Legends ^^

Rocket Leauge is the best game ever with friends, you can be angry one minute and the next love them lol

Don't starve together is an interesting game for multiplayers/friends online, but I think it only appeals to some people. And considering the games you're playing currently/the recommendations you may not enjoy it???

Smash bros,AoE2, CS...

Garry's mod is the best in this case!

Battlefield 4, maybe Metin?