FlightGear Flight Simulator: free open-source multiplatform flight sim
An interactive viewer for three-dimensional chemical structures.
Tools to process and visualize scientific data and images
Scanning Probe Microscopy Controller and Data Visualization Software
Xj3D is an open-source Java codebase for the X3D Graphics standard.
Rayshade raytracer
CIRT - CUDA Interactive Ray Tracer
Open Source Solid Modeling CAD