DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
a parametric 3D CAD modeler
CFDTool - Easy to Use Computational Fluid Dynamics (CFD) Toolbox
Design your own pottery for 3D printing in full color
Free 3D Mobile CAD
Software to analyse 3D and 2D framed structures, also gives matrices
dedalo is a 2d cad drawing software written in python3.
Open Source CAD