Avogadro libraries provide 3D rendering, visualization, and analysis
Real-time physically based rendering engine for Android, iOS, and more
crossplatform multithreaded object-oriented render and audio engine
Scanning Probe Microscopy Controller and Data Visualization Software
Vivid is a modern C++ 3D engine using OpenGL4+
Design your own pottery for 3D printing in full color
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Cross-platform 2D and 3D game engine
A Realistic and Rich 3D Environment
.NET wrapper for the Irrlicht Engine
Gimpel3D - 2D/3D Stereo Conversion Editor
3D game engine for C and C++
QCSS Player by Shuffle
Megalui: 2D/3D OpenGL & C/C++ Library for Scientific Visualizations
A 3D rendering / entity engine