SpaceCAD

"SpaceCAD tells you if your model rocket is stable, how high it will go and which engine you should use. SpaceCAD automatically determines the stability of your model rocket. You can see your model rocket in 2D and 3D rendering. By just clicking a button, SpaceCAD calculates how high your model rocket will fly. SpaceCAD also helps you build your rocket design by providing multiple printout options."

AstroWorkBench

"Some of the main features of this astronomy package: graphical planetary data and positional information. View all planetary positions at once and in an instant know what is visible. Jupiter data, orbital maps, and animation of main satellites. Lunar positional and apparition data. Sun rise and set. Messier, Caldwell, and NGC data and graphical positional information. Build a database of objects you wish to view in your next session. A quick sky view chart so that you can instantly see what is visible tonight. A classic sky map view of the sky. A single map view of the entire sky. A detailed view of a specified constellation."