Kerbal Space Program is described as 'Create and manage your own space program, build and fly spacecraft, and try to conquer space' and is a simulation games in the education & reference category. There are more than 10 alternatives to Kerbal Space Program for a variety of platforms, including Windows, Steam, Mac, iPad and Linux apps. The best Kerbal Space Program alternative is Orbiter, which is both free and Open Source. Other great apps like Kerbal Space Program are Children of a Dead Earth, Space Simulator, Space Agency 2138 and Archean.
Reentry is a space flight simulator based on real life spacecrafts. You create a new astronaut, gain levels and experience for every move you make by completing missions in space.
