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.
Cost / License
- Free
- Open Source
Platforms
- Windows



Comments about Orbiter as an Alternative to Kerbal Space Program
looks like it i think it's a clone


Most users think Orbiter is a great Kerbal Space Program alternative.
Orbiter is the most popular Windows alternative to Kerbal Space Program.
Orbiter is the most popular Open Source & free alternative to Kerbal Space Program.
- Orbiter is Free and Open Source




















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.