Accurate, flexible wireframe simulator for the Voyager and Giotto space missions, with animation capability. Developed at JPL for science/navigation, and filmed by the BBC/NOVA. Conveniently runs from any Windows/DOS.
Downloads: 96702 - Freeware - Download Now

Complete 2011 Nautical Almanac in pdf format. Includes monthly star charts with the planet's positions.
Downloads: 100959 - Freeware - Download Now

Educational orbit and gravitation simulator for high school, college and beginning university physics and astronomy. Easily create, run, print and save a simulation. Includes 29 premade simulations with activities page in html-format.
Downloads: 64192 - Shareware - Download Now

Patent Bar Simulator - USPTO Registration Examination Practice Simulation Software. Nine Complete Actual Exams with Explanations updated to reflect the changes to the law and the rules brought about by the American Inventor's Protection Act of 1999.
Downloads: 56263 - Shareware - Download Now

Aciqra is a free and open source virtual planetarium and sky mapping program which tracks celestial bodies including planets, deep sky objects and stars.
Downloads: 98189 - Freeware - Download Now