Open-source parametric 3D CAD for makers
a parametric 3D CAD modeler
Free, open source parametric CAD
Extensible Line-drawing & Polygon-filling Rasterization Libs for Java
An EnergyPlus shell for parametric studies and more ...
Design your own pottery for 3D printing in full color
Balances Chemical Equation
3D CAM program for CNC mills/lathes
Simple CAD program