JavaScript 3D library
A renderer agnostic two-dimensional drawing api for the web
An interior design application to draw house plans & arrange furniture
Java3d scenegraph editor
Vivid is a modern C++ 3D engine using OpenGL4+
Gphoton in a simple 3d modeler and ray tracer.
Megalui: 2D/3D OpenGL & C/C++ Library for Scientific Visualizations