CADCraft: computer-aided design and drafting
A CAD application for creating virtual LEGO models
An open source harness for generating CAD models
Libre and open source desktop application to create diagrams
Open-source parametric 3D CAD for makers
Ink/Stitch: an Inkscape extension for machine embroidery design
DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
A 2D CAD application for civil engineering , built with Free Pascal
EPA SWMM editor with 2D overland flow, 1D-2D coupling and sewer design
CFDTool - Easy to Use Computational Fluid Dynamics (CFD) Toolbox
A math-inspired CAD program in haskell. CSG, bevels, and shells
Free 3D Mobile CAD
An easy and flexible mathematical programming environment for Python.
Open Knowledge on engineering development.
A package for Isogeometric Analysis in Octave and Matlab