Newton`s Aquarium is an interactive physics package that helps students visualize and understand Newton`s Law of Universal Gravitation. While creating and exploring their own solar systems, students encounter the core concepts in classical physics.

Freeware. 390 units in 46 categories. Includes engineering specific categories like enthalpy, heat capacity, heat transfer coefficient, torque and viscosity. Work with feet and inches. Formatting and clipboard features. Excludes archaic units.

Earth Explorer is an interactive 3D earth browser with amazing imagery and vast geography information. You can locate a position by name, calculate distance between any two points,or view the distribution of countries, cities, coastlines, etc.

ChemAP 2003 is a periodic table that allows you to quickly find ionization energies, bond orders, isotopes and their weights, and much more. The program includes utils to calculate weights, graph the properties, etc.. and more chemistry tables.

C88 provides detailed informations about the celestial sphere objects, visible with naked eyes and for the use of an eyepiece of a modest amateur telescope to observe deep sky objects. Complex informations about the planets are available too.

Presents a 3-color graph that shows when a planet, the moon or the sun is visible during any year from 3000 BC to AD 6000 at any location on the earth. Times of solar and lunar eclipses are marked and the dates of heliacal phenomena are computed.

An accurate digital orrery with a wealth of functionality. The most noteworthy functions are date spec. (past, future), 2D/3D orbital animation and custom zoom, orbits of 10000+ asteroids and comets, printing and statistic and information windows.