I've been considering opening up a topic like this for a couple of days. HGN has a small selection of servers, and I want to see what you'd like as well.
I think we should start off with something just about everyone can run at the moment. Stuff that even a rig about a decade old can still run. So tell me, in your own words: What Multiplayer/Sandbox/Survival games do you think would make a good Roleplay Server?
Personally; I'd like to eventually see a H1Z1 RP server... or even get a SS13 server going again.