64		Trevor Sorensen's Star Legions (DOS, 1992)
64		Traders: The Intergalactic Trading Game (DOS, 1992)
61		Pax Imperia: Eminent Domain (Windows, 1997)
60		Distant Worlds (Windows, 2010)
60		Star Shipping Inc. (Windows, 2010)
60		Star Lords (DOS, 2001)
60		Interstellar Trader 2 (Windows, 2003)
55		M.A.X.: Mechanized Assault & Exploration (Windows, 1996)
55		Imperium Rex (DOS, 1993)
54		Spaceward Ho! (DOS, 1992)
54		M.A.X.: Mechanized Assault & Exploration (DOS, 1996)
52		Emperor of the Fading Suns (Windows, 1996)
51		Space Empires III (Windows, 1997)
50		Reach for the Stars: The Conquest of the Galaxy (DOS, 1988)
50		Anacreon: Reconstruction 4021 (DOS, 1987)
50		Starship Kingdom (Windows, 2007)
50		Master of Orion 3 (Windows, 2003)
50		Anacreon: Imperial Conquest in the Far Future (Windows, 2004)
50		WarTorn (Windows, 2000)
50		Reach for the Stars (Windows, 2000)
50		Dominant Species (Windows, 1998)
40		Golem (Windows, 2004)
40		Dogs of War (Windows, 2000)
40		Planet M.U.L.E. (Windows, 2009)

Notes: Games similar to When Two Worlds War, Games like When Two Worlds War, Edward Grabowski Communications Ltd., Impressions, DOS, Strategy, Tactics, Sci-Fi, Futuristic, Managerial, Business Simulation, Top-down, PC, Game Similarities.