...Explore all the planets, some meteorites and a single comet as Kuiper Belt Object. Use the "hyper move" for rapid movement or fly with help of an autopilot automatically from planet to planet.
OpenGL Planets runs under Windows. Full source is included. It's written in Delphi 7 and OpenGL (DelphiGL).
There is a German tutorial on my hompage at URL:
http://www.daniel-schwamm.de/index.php?pg=delphi-tutorials/opengl-planets.