95		Adeptus Titanicus: Dominus (Windows, 2018)
74		Battlestar Galactica: Deadlock (Windows, 2017)
72		Star Hammer: The Vanguard Prophecy (Windows, 2015)
60		Warhammer 40,000: Chaos Gate (Windows, 1998)
60		Final Liberation: Warhammer Epic 40,000 (Windows, 1997)
54		Battlefleet Gothic: Armada (Windows, 2016)
53		Tastee: Lethal Tactics (Windows, 2016)
52		Star Ruler 2 (Windows, 2015)
52		Sins of a Solar Empire (Windows, 2008)
52		Galactic Inheritors (Windows, 2015)
51		Star Ruler (Windows, 2010)
51		Frozen Synapse (Windows, 2011)
51		Falling Skies: The Game (Windows, 2014)
50		Power: The Game (Windows, 1995)
50		Commanders: Attack of the Genos (Windows, 2008)
50		Cosmic Supremacy (Windows, 2009)
50		Muck Men from MARS! (DOS, 1991)
50		Space Conflict (DOS, 1993)
50		Galactic Assault: Prisoner of Power (Windows, 2007)
50		Smugglers 2 (Windows, 2001)
50		Crimson Fields (Windows, 2001)
50		WarHeads (Windows, 1997)
50		Star Trek: Away Team (Windows, 2001)
50		Star Wolves 3: Civil War (Windows, 2009)
50		RIM: Battle Planets (Windows, 2001)
50		Shattered Union (Windows, 2005)
50		Laser Squad: Nemesis (Windows, 2005)
46		Homeworld: Remastered Collection (Windows, 2015)
46		Warhammer 40,000: Mechanicus (Windows, 2018)
45		Space Hulk: Tactics (Windows, 2018)
45		Clad in Iron: Sakhalin 1904 (Windows, 2018)
44		Clad in Iron: Gulf of Mexico 1864 (Windows, 2017)
43		Homeworld: Cataclysm (Windows, 2000)
43		Homeworld (Windows, 1999)
42		Space Hulk: Ascension (Windows, 2014)
41		Ancient Space (Windows, 2014)
41		Homeworld 2 (Windows, 2003)
41		Massive Assault Network 2 (Windows, 2006)
41		Massive Assault Network (Windows, 2004)
40		Space Hulk (Windows, 2013)
40		Lords of the Black Sun (Windows, 2013)
40		Smugglers (Windows, 2001)
40		Star Wars: Force Commander (Windows, 2000)

Notes: Games similar to The Horus Heresy: Betrayal at Calth, Games like The Horus Heresy: Betrayal at Calth, Steel Wool Studios, Steel Wool Studios, Windows, Strategy, Tactics, Sci-Fi, Futuristic, Turn-based, 3rd-person, Other, Free-roaming camera, Warhammer 40, 000, PC, Game Similarities.