Games like Imperium Galactica. 20 Similar Games.

1. Imperium Galactica. (1997)
2. Imperium Galactica 2  (2000)
3. Sins of a Solar Empire. (2008) 
4. Nexus: The Jupiter Incident. (2004)  
5. Armada 2526. (2009)
6. Haegemonia: Legions of Iron. (2002)
7. Sword of the Stars. (2006)
8. Lost Empire. (2007)
9. Star Wars: Empire at War. (2007) 
10. Endless Space. (2012)
11. Master of Orion 2. (1996)
12. Space Empires 5. (2000)
13. Galactic Civilizations. (2006)
14. Ascendancy. (1995)
15. Distant Worlds. (2010)
16. Star Wars: Rebellion. (1998)
17. Star Trek: Birth of the Federation. (1999)
18. Pax Imperia: Eminent Domain. (1997)
19. Civilization: Beyond Earth. (2014)
20. Endless Legend. (2014)