SpaceEngine's planets and moons, in KSP, from your own copy of SpaceEngine.
Kerbal Space Program, flown in SpaceEngine's universe. The Sun, all eight planets, their moons and the dwarf planets are built from SpaceEngine's own catalog and surface maps, read from your copy of SpaceEngine.
Launch from Cape Canaveral, Florida, on a 1/10-scale Earth where stock rockets still reach orbit, with a full-size Moon hanging close overhead. Distances everywhere else are real, so time warp goes up to 1,000,000x.
Press Alt+U in flight to open the teleport menu: pick any world, click its map and land there, or jump straight into orbit. It moves a whole ship or a kerbal on EVA.
Needs: Kerbal Space Program 1.12 and SpaceEngine (Steam) on the same PC. Single player. The first start takes a few minutes while SpaceEngine's maps are converted; later starts are normal.