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 ...
Free cad viewer for 3d drawings in different formats
3D CAM program for CNC mills/lathes
Simple CAD program