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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
QCAD - QCAD is an application for computer aided drafting in 2D.
Draft it - Draft it is a CAD software package that allows to create, save, & print work with drawing tools that allows to create professional drawings for project.
FreeCAD - An open-source parametric 3D modeler
Piglet Drawing Editor - 2-D engineering drawing editor that supports hierarchical object description
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.