FlightGear Flight Simulator: free open-source multiplatform flight sim
An interactive viewer for three-dimensional chemical structures.
Open Source Solid Modeling CAD
A real-time 3D Engine written in Ada
Scanning Probe Microscopy Controller and Data Visualization Software
A real time 3D graphics engine written in C++
PyMOL is an OpenGL based molecular visualization system
free implementation of the OpenGL Character Renderer
3D .NET engine for Windows, Linux, Mac
Webgl Engine
A world editor for HGE game engine written in python and uses OpenGL.