Crusader Kings 2 Multiplayer Game
I'm thinking about organizing a multiplayer CK2 campaign because of the CK3 hype with release later this year. That said, CK2 base game is free on steam and you don't need any DLC to play MP. As long as the host (me) has all the DLC, then you can enjoy the full game for free.
If anyone is interested we can discuss a rule set and date/time.