Alternatives to NASA World Wind

	NASA World Wind Version: 2.2.0 Zoom in to any place on Earth via NASA's satellites	Half-Life 2 Version: First-person shooter game for Windows and Apple	Virtual Lab Version: 6.2.2 Check out the microscopic world around you with a virtual microscope simulation provided by NASA	$Math Science Quest thumbnail$ Math Science Quest Version: 1.4 Learning game for essential reasoning and scientific skills
LICENSE	Free	Paid	Free	Free
LANGUAGE	English	English	English	English
OS	Windows XP	Windows ME	Windows Vista	Windows NT
Author	NASA	Valvesoftware	Joonas “Regalis” Rikkonen	Accelerated Learning Foundation
Rating	7.5/10 (176)	6.8/10 (1292)	6.4/10 (81)	8.3/10 (11)