- Terra Sauri: (dinosaur civilization game set before KT extinction, can be converted over to Mythos)
- Mythos: (fantasy theme game with Elves, Orcs, Wizards, Amazons and whatnot; can be converted over to Sunrise of Civilization
- Sunrise of Civilization: (Ancient Antiquity game from the rise of human civilization to the death of Alexander the Great)
- Roma Universalis: (Antiquity game from the founding of Rome to the final division of the Roman Empire in 395 AD).
- Barbarian Warlords: (Dark age game from the final division of the Roman Empire to the death of Charlemagne).
- Crusader Kings II: (Medieval age game from 769 to 1453).
- Europa Universalis IV: (Renaissance and early Industrial age game from 1444 to 1820).
- Victoria III: (Industrial age game from 1836 to 1936).
- Hearts of Iron IV: (World War II themed game).
- Eagle and the Bear: (Cold War themed game).
- Pax Americana: (Current era themed game).
- Stellaris: (Sci-Fi themed game).
I already have a fantasy GSG idea, called Cilagrush Legends. It doesn't take place on earth, but it could be converted to the original Crusader Kings.