SwiftShader is a high-performance CPU-based implementation
A really simple (following K.I.S.S statement) ray tracing project.
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Java 2D graphics/utility library
an interactive 3D viewing program
Software for data analysis, image processing, simulations, solver.
3D game engine for C and C++
smart car simulator
A 3D rendering / entity engine