The most impressive websites in the world use 3D graphics
Read, write and edit metadata
A portable, multi-platform, command-line driven graphing utility
a parametric 3D CAD modeler
Powerful desktop publishing software
An award-winning drawing program for children of all ages
Swiss army knife of image processing
FlightGear Flight Simulator: free open-source multiplatform flight sim
Panorama photo stitcher
GPS log file viewer and analyzer
A premier mind-mapping software written in Java
Scanning probe microscopy data visualisation and analysis
Model Railway CAD program
GTK+ comic book viewer.
3D Engine c++