From PortableApps: LibreCAD is a free Open Source CAD application for Windows. Support and documentation is free from our large, dedicated community of users, contributors, and developers. LibreCAD is a fully comprehensive 2D CAD application that you can download and install for free. It is a 2D CAD drawing tool based on the community edition of QCad LibreCAD has been re-structured and ported to qt4.
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