Kerbal Space Program is a space flight simulation video game developed and published by Squad for Microsoft Windows, OS X, Linux, PlayStation 4, and Xbox One. In the game, players direct a nascent space program, staffed and crewed by green humanoid aliens known as "Kerbals". The game features a realistic orbital physics engine, allowing for various real-life orbital maneuvers such as Hohmann transfer orbits and bi-elliptic transfer orbits.
Mirrored from TPB from mercs215
Not 100% sure how safe this link is, so do be careful.