Starlab is a software package for simulating the evolution of dense stellar systems and analyzing the resultant data. It is a collection of loosely coupled programs (``tools'') linked at the level of the UNIX operating system. The tools share a common data structure and can be combined in arbitrarily complex ways to study the dynamics of star clusters and galactic nuclei.
The free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X, providing photo-realistic, real-time, three-dimensional viewing of the solar system, the galaxy and the universe. It is an easy to use, freely-distributed, multi-platform, open source, software package which has become a valuable tool for astronomy education.
This site is developed and maintained by John Walker, founder of Autodesk, Inc. and co-author of AutoCAD. A variety of documents, images, software for various machines, and interactive Web resources are available her