Forgotten Soldiers

Title explains itself, just me writing down a few multiplayer games which it would be cool to have servers for.
Don't Starve Together: On one side of the survival themed games, we have Minecraft. On the complete opposite side we have Don't Starve. DST is multiplayer survival at its best. Not dying is a challenge, and you always are managing resources. And mostly everything in DST can, and most likely will, kill you. Reason it would be cool to have a server for it? Because who hasn't wanted to see how hard it is to actually survive in a truly hostile world? Plus, the mods are cool to use. Some are so OP it is untrue. (The Dust character, for instance, has way to many positives for his own good [can't freeze during winter, about a x2 attack bonus when attacking enemies, most insanity auras from mobs don't affect him, his hat provides unlimited sanity regen and can be used as an emergency light source, and Arhah is basically a infinite dark sword{in other words, really op}])
Minecraft: Because really. Who hasn't ever at least heard of MC? It's one of the most influential games of the century. The downside of course is that MC is better with mods installed. Else, its kinda boring. Not sure how hosting modded servers work, but someone will probably explain that to me.
Terraria: Though a terraria server would not last long, it would be cool while it is there. Replaying the game over and over with different classes is very satisfying, and there are a few mods that are out there that are cool. I've actually never used a Terraria mod before. The base game is that satisfying. Also. While MC has hardcore mode, Terraria has expert mode. More drops, more difficulty.
Those are just the suggestions I could come up with. If anyone has anything else they can think of, feel free to comment.

Minecraft yum

I actually recently found out that Kerbal Space Program has a multiplayer mod for it. Neato.

Killing Floor and Killing floor 2