FlightGear Flight Simulator: free open-source multiplatform flight sim
A portable, multi-platform, command-line driven graphing utility
An interactive viewer for three-dimensional chemical structures.
Toolkit for working with and mapping geospatial data
Open Source Solid Modeling CAD
Jiddu Krishnamurti's Book of Life|Libro de la Vida
A modern digital design tool.
Concise spatial query and representation system (c-squares)
Graphical Interface for Medical Image Analysis and Simulation
MathJax support for MathML content embedded in SVG documents
Alignments in Rotating Cylinder / 3D
Hand Written Equation Creator
OSGeo project deegree