Rendering of 2D and 3D Celtic Knots
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Carbon Fullerene and Capped Nanotube Generator
an interactive 3D viewing program
3D game engine for C and C++
collection of illustrative programs:small games, simulators: C, Matlab
Not your usual Architectural Modeler
AVAS - Atomic Visualisation and Analysis Software.
A small simple system for 3d line drawings in LaTeX.
https://github.com/horde3d/Horde3D
Multi-Language Wrapper Collection for the Irrlicht Engine