53		Warren's World: Lost Colony (DOS, 1982)
48		Star Trek (DOS, 1981)
44		Visual Star Trek (DOS, 1990)
43		Galactic Encounters (DOS, 1982)
42		Begin: A Tactical Starship Simulation (DOS, 1989)

Notes: Games similar to Quadrant, Games like Quadrant, DOS, Simulation, Strategy, Tactics, Sci-Fi, Futuristic, Turn-based, Text-based, Spreadsheet, Fixed, Flip-screen, PC, Game Similarities.