They all are, and pretty good ones at that.
Betrayal is a rogue like mystery game. think scoobert doo but with more cosmic horror. Three-Six people explore a mansion uncovering it's secrets until the Haunt begins
At which point one or more players is designated as the traitor and both teams, Traitor and Survivors must accomplish a goal before the other.
Secret Hitler is a doozy, essentially werewolf or mafia but heaps more entertaining. The stage is set in the Wiemar Republic, the interphase government between the German Empire, and the Third Reich. Where two teams, Liberals and Fascists are vying for control over the country by passing two kinds of laws. Liberal or Fascist, if too many of either side's are passed that side wins. Alternatively Liberals win by killing Hitler and Fascists can win by electing Hitler chancellor after three fascist laws have been enacted. (Which is a whole concept in of itself where at what point I'd have explained how to play)
Diplomacy is the ex-crown jewel of my collection and is a war game set in 1900's Europe having players take on the reigns as one of the seven major nations of the time the game itself is based on Diplomacy and being able to know when to lie, cheat, and bully the other players or when you should attempt a more peaceful non-aggressive route. however at one point in the game any nation who wants to win will have to go it alone, as victory means controlling nearly half of all of Europe.
As to where I found this server, Reddit while searching for the aforementioned server type mentioned above.
I heard that there was a war with Artillery involved and I was immediately taken to finding out more.