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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.
NttCAD - Free 2D/3D CAD software, easy to use and multi-platform
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.
Piglet Drawing Editor - 2-D engineering drawing editor that supports hierarchical object description
KediCAD - CAD/CAM/ FEA software for Linux