a parametric 3D CAD modeler
LibrePLM integrates CAD editors in Odoo / LibrERP
Cross-platform Open-source 2D CAD
Open-Source Multiphysics FEA (FEM) Package
ALST is a CAD for all imaginable logic systems (binary, ternary, etc)
A Linux CAD system
Cuts 3D objects from polystyrene foam (EPS/XPS)