Multiplayer Co-Op RPGs?

What are the best you can think of? (Preferably with no monthly fee)

I've played pic related but it had shit online multiplayer, and stopped working randomly, i'm still looking for a fix.
I also liked Path of Exile which i'm gonna try again once the 6 added chapters update is gonna hit.

Divinity Original Sin : Enhanced Edition.

My bad, I mistook multiplayer for co-op.
Still a really kickass game though.

Yeah most stuff flagged as multiplayer has one single arena for pvp.
I wonder if they do it to get the multiplayer tag as percieved added value

Baldur's Gate: Dark Alliance 2
I don't know if 1 is. Pretty fun, worth a try if you can emulate/find an old copy.

Baldur's Gate 1/2
Icewind Dale
Neverwinter Nights 1/2
Divinity: OS
Diablo 2
System Shock 2 (yes, really)

How many of those can i host with Hamachi?
I don't wanna deal with shit servers from 2002, Two Worlds already fucked me in the ass.

I've played all of them through Hamachi or direct connect at one point or another except for D:OS which might use steam servers.

Champions of Norrath has 4 player co-op

D&D: Heros for Xbox