JavaScript 3D library
Avogadro libraries provide 3D rendering, visualization, and analysis
Open Source Solid Modeling CAD
An interactive viewer for three-dimensional chemical structures.
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
LDraw™ editor for LEGO® style digital building instructions.
C++ header-only library that simulates GLSL math
Interactive 3D Layout Viewer for GDSII
3D rendering and scene graph library (moved to GitHub)
3D Software Renderer in 700 Lines
Pear3DEngine is a modern and modular 3D development framework