LibreCAD is one free Open Source CAD application for Windows, Mac and Linux. Support and documentation is free from a large, dedicated community of users, partners and developers.
LibreCAD started as a project for creation of CAM capabilities in the community version of QCad for use with a Mechmate CNC router.
Since QCad CE was developed with the old bookcase Qt3, had to be ported to Qt4 before additional improvements. This led to CADuntu.
The project was known as CADuntu only for a few months before the community decided the name was inappropriate. After some discussion and research on existing names, CADuntu was renamed LibreCAD.
Porting the rendering engine to Qt4 turned out to be a big project, so LibreCAD initially depends on the Qt3 support library. The port to Qt4 was finally completed on duration of series 2.0.0 development, thanks to lead developer Rallaz.
Meanwhile, for the LibreCAD 2.2.0 series, Qt5 is required.
Download the application at platform you are interested in