a parametric 3D CAD modeler
A CAD application for creating virtual LEGO models
A 2D CAD application for civil engineering , built with Free Pascal
Electric Design Tool
Free, open source parametric CAD
Model Railway CAD program
very good CAD software
CAD Application entire developed in Python
PyAMS (Python for Analog and Mixed Signals) CAD approach
Free and open source pattern design software
LibrePLM integrates CAD editors in Odoo / LibrERP
Free pcb editor
Solve Alignment of Road , Rail,Tunnel
Free software for maps
DSpice: Design and Simulation of Circuits using Spice
Free Invoice & Billing Software for Windows, Linux & Mac
Free, open-source storm sewer design: Rational, Manning, HGL, HEC-22
Open Source Desktop GIS with Surveying and Cartography Functionality
Create and edit LDraw™ parts quick and easy.
GDSread reads and converts Calma GDS stream files .
The programmer's solid 3D CAD modeller
Cross-platform Open-source 2D CAD
CAD application for Technical Drawing exercises in Android
SOLVESPACE is a free (GPLv3) parametric 3d CAD tool.