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gVirtualXRay is a C++ library to simulate X-ray imaging. It is based on the Beer-Lambert law to compute the absorption of light (i.e. photons) by 3D objects (here polygon meshes). It is implemented on the graphics processing unit (GPU) using the OpenGL Shading Language (GLSL).
SimpleGVXR is a smaller library build on the top of gVirtualXRay. It provides wrappers to Python, R, Ruby, Tcl, C#, Java, and GNU Octave.
Multithreaded N-Point Gravity Simulation for PC and Android
Create a sun, spin some asteroids around it, and watch them collide and form planets.
An N-Point Gravity Simulator is a realistic simulation in which all points attract each other: even the smallest asteroid has its own gravitational field that can affect even a large sun far away from it.
Can be reused as a library for making games.
If used as library, license is GNU LGPLv3, otherwise it's GNU GPLv3.
...Some properties of the optical system are calculated in real time.
3. The virtual optical rail as a ray-tracing simulation of the optical system. The goal is to provide fast and useful diagnostic images, not realistic blur.
Additionally there is full access to the java source code under the terms of the GPLv3.