The programmer's solid 3D CAD modeller
Console-based GLSL Sandbox for 2D/3D shaders shaders
Interactive 3D Layout Viewer for GDSII
C++ libraries for manipulations in non-Euclidean geometry
Simple Road Design and Earthworks
OpenGL shell and horn generator
Interactive geometry software for Euclidean and non-Euclidean spaces
Open Source Solid Modeling CAD
An application for analytic geometry education