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KStars
[18 users on Ohloh]
KStars is a graphical desktop planetarium for KDE. It provides an accurate simulation of the night sky, as seen from any location on Earth, on any date. The display includes 40,000 stars, 13,000 deep-sky objects, 2500 comets and asteroids, all 8 planets, and the Sun and Moon.
Kalzium
[10 users on Ohloh]
Kalzium is an application which will show you some information about the periodic system of the elements. Therefore you could use it as an information database. It also includes an equation solver and 3D viewer for molecules.
Step
[3 users on Ohloh]
Step is an interactive physical simulator. It works like this: you place some bodies on the scene, add some forces, such as gravity or springs, then click "Simulate" and Step shows you how your scene will evolve according to the laws of physics. You can change every property of bodies and forces in your experiment (even during simulation) and see how this will change evolution of the experiment. With Step you can not only learn but feel how physics works!