CADAM is the open source text-to-CAD web application
Virtual Satellite
a parametric 3D CAD modeler
DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
A Cross Platform and Open Source Electronics Design Automation Suite
Free and open source pattern design software
RHT-LA : Applicatif Tracé Ligne Aérienne HT
conducteö - logiciel de calcul des ponts thermiques linéiques
An EnergyPlus shell for parametric studies and more ...
Simple Road Design and Earthworks
LibrePLM integrates CAD editors in Odoo / LibrERP
very good CAD software
PyAMS (Python for Analog and Mixed Signals) CAD approach
3D/2D Concrete Reinforcement in Bentley MicroStation
Open-Source Shoemaking
Extensible Line-drawing & Polygon-filling Rasterization Libs for Java
GDSread reads and converts Calma GDS stream files .
A math-inspired CAD program in haskell. CSG, bevels, and shells
Software for electromagnetic simulation
Cross-platform Open-source 2D CAD