Crusader Kings is described as 'Unlike other Paradox titles (such as the first two Europa Universalis series), Crusader Kings is a dynasty simulator with similarities to role-playing video games in that it focuses on a trait-based individual whose primary goal is the growth' and is a Historical Game in the games category. There are more than 10 games similar to Crusader Kings for a variety of platforms, including Windows, Linux, Mac, Steam and Web-based apps. The best Crusader Kings alternative is Civilization. It's not free, so if you're looking for a free alternative, you could try FreeCiv or Imperial Domination. Other Crusader Kings like games are Europa Universalis, Total War, Hearts of Iron and C-evo: New Horizons.