A planetarium software that shows a 3D simulation of the night sky
Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets, nebulae and others things like ground, landscape, atmosphere, etc.
IMA2 Simple command-lineeditor of binary files (images, object filers, byte code, etc). More sofisticated that F4 option in FAR. More simple that GUI hex editors. Can be useed as command-line utility in scripts.