Here is an official OiM faction list. If you have some comments on factions names, please post them here.

1. Habsburg Empire
2. Grand Principality of Lithuania
3. Venetian Republic
4. The Great Don Cossack Army
5. Duchy of Kurland and Zemgalia
6. Hohenzollers
7. European Ottoman Empire
8. The Zaporozhian Cossack Army
9. Safavids
10. Wallachian Principality
11. Moldavian Principality
12. Dukedom of Transylvania
13. Imeretian Kingdom
14. Crown of Poland
15. Kingdom of Sweden
16. Crimean Khanate
17. Moscow Tzardom
18. Nogays
19. Montenegro
20. Kingdom of Kartli