Download either a Windows installer for the original version of Orbis or check out an upcomping (incomplete) open source version on github.
Orbis in action...
Check out some of the screenshots
of Orbis in action or watch this short video showing how you would
create a simple benzene ring and then
convert it to
Watch in HD full screen for best effect
Or this video of Orbis displaying the 24 membered molecule Coronene