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FreeCAD is an parametric 3D modeler that lets you sketch geometry-constrained 2D shapes and use them as a base to build 3D objects. The program also allows you to easily modify your design by going back into your model history and changing its parameters.

FreeCAD reads and writes to many open file formats such as STEP, IGES, STL, SVG, DXF, OBJ, IFC, DAE.

Cross platform (Mac, Linux). Many user-contributed addons/macros are also available, for example to let you easily create screws and bolts, instantly construct lego bricks, etc.

Win 7 users may encounter an error starting FreeCAD, due to a missing 64-bit .dll file.

Stellarium is a planetarium for your computer. It shows a realistic sky in 3D like what you see with the naked eye, binoculars, or a telescope, with realistic atmosphere, sunrise and sunset. It features over 120,000 stars from the Hipparcos catalog with associated information.

Stellarium Portable is a portable version of the program. The 0.22.x 32-bit version is also included for use on Windows 7, 8, 8.1, and 10 32-bit. Version 0.13.3 is available for Windows XP. Alternatively, X-Stellarium is also available.

Graphical Expression Viewer can be used to visualize graphs of common mathematical functions. You can type in functions of the type z=x*sin(y), specify a range and then generate the graph for the function. The generated graphs can be rotated by dragging with the mouse. The application has a few interesting graphs built into it that you can select from.

Note: This application requires a 3D card with OpenGL support.

Solar System Information displays detailed information about the planets and their moons in our solar system. The images are all from real photos. You can use your mouse to manipulate the planet and rotate it in any direction.

Note: This application requires a 3D card with OpenGL support.

Torus Trooper is a 3D shooter that is all about speed and high scores. Race against the clock with guns blazing, hunting all the little ships and boss ships you possibly can while avoiding all of their shots. Reaching certain scores and destroying bosses will add some time, though losing a ship will knock you down by 15 seconds.

Space Invaders OpenGL is a 2D/3D game based on the old arcade classic in which you must destroy enemy ships by shooting them up. It should run on any machine with a 3D accelerator card and OpenGL drivers.