SketchUp - 3D for Everyone
Altair Inspire - Altair Inspire enables design engineers, product designers, and architects to create and investigate structurally efficient concepts quickly and easily.
Arena - Chess GUI Arena
VectorEngineer - VectorEngineer is a CAD software system that you can use to create technical 3D drawings.
PTC Creo Sketch - Creo Sketch is an easy to use 2D CAD application for capturing and creating new 2D freehand concepts which is available on PCs, Macs, and iPads.
ANSYS SpaceClaim - SpaceClaim 3D Modeling Software Solves Geometry Problems Fast.