What is Orbiter?
Orbiter is a realistic 3D real-time space flight simulator program.
Fed up with space games that insult your intelligence and violate every law of physics? Orbiter is a simulator that gives you an idea what space flight really feels like - today and in the not so distant future. And best of all: you can download it for free!
Launch the Space Shuttle from Kennedy Space Center and rendezvous with the International Space Station. Recreate historic flights with addon spacecraft packages: Mercury, Gemini, Apollo, Vostok and more. Plan interplanetary slingshots and tour the solar system with futuristic space craft. Design your own rockets, or download addons created by other users. Learn about the concepts of space flight and orbital mechanics by playing and experimenting.
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Comments and Reviews
Said about Orbiter as an alternative
looks like it i think it's a clone
In no way is orbiter a KSP clone... it's a realistic simulator in continuous development for 21 years and counting. Orbiter is a flight simulator, not a game. When KSP just doesn't satisfy you anymore and you can calculate Hohmann transfers in your head, try this.