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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
FreeCAD - An open-source parametric 3D modeler
NttCAD - Free 2D/3D CAD software, easy to use and multi-platform
gCAD3D - 3D - CADCAM - Software for MS-Windows and Linux. Freeware
TYCAD - TYCAD is a application for computer aided drafting (CAD) in two dimensions (2D).
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.