Free and open source pattern design software
a parametric 3D CAD modeler
DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
LibrePLM integrates CAD editors in Odoo / LibrERP
Software for electromagnetic simulation
Open Source Planar Linkage Mechanism Simulation and Synthesis Software
OpenNum lets you distribute solvers with a nice graphical interface
Open Knowledge on engineering development.
An Open source Analysis and SImulation Toolbox for Fuel Cells
Open Source FabLab Project
dedalo is a 2d cad drawing software written in python3.