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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.
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
NttCAD - Free 2D/3D CAD software, easy to use and multi-platform
TYCAD - TYCAD is a application for computer aided drafting (CAD) in two dimensions (2D).
FreeCAD - An open-source parametric 3D modeler