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"OnlineLabs.in aims to serve as a comprehensive, encyclopedic reference about online labs in a variety of subjects, particularly virtual laboratory simulations for science education. We categorize useful listings for online lab simulations, virtual science experiments and free educational software. We currently feature resources in Chemistry, Physics and Biology to help learners identify free and commercial virtual science labs. We also offer online educational resources and information about simulations and free software in Anatomy, Geology, Astronomy, Design and Math. Through these online resources, you can get hands-on science and math experiences without having to set foot in a physical classroom or laboratory environment."

"... The free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X. "

Graeme Monk you might like this one!

download virtual microscope to to view 90 samples

"Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is being used in planetarium projectors. Just set your coordinates and go. "