Can you guys recommend some good CO-OP online games?

A Way Out or Portal 2 minecraft is also a fun chill multiplayer game.

Left 4 Dead 2, Call Of Duty, Garry's Mod, WolfTeam, World Of Warcraft, League Of Legends, these are top tier (in my opinion) and are real good co-op games so I highly recommend playing them and giving them a try.

Borderlands in general (3 is the only one I really wouldn't play at all, really underwhelming), Sven-Coop, Magicka, GTAV/GTASAMP, Spacehulk DeathWing, Human Fall Flat, plethora of others, but these are the most recent ones I've played.

Way out. Reaaally good game. I played it with a friend it is so fun. Its not that classic co-op game.

I might give Escapist a shot, looks pretty fun and lots of recommendations here

If you are playing with a friend, then Dead Island,Killing floor

Garry's Mod, Payday 2, and Portal 2. Those are the ones I know for now and played. But there are many more games out there.

Try to plan Dont starve together. One of the best games for coop

Well, if you are a LOTR fan I definitely recommend playing BFME 2 online on GameRanger with a few friends.

I dont know if it is still actual but best Co-OP game i ever played is SVEN CO-OP