LibreCAD is a free Open Source 2-D CAD
cross-platform application. Support and
documentation is free and large with
dedicated coummunity of users contributing
in it.
Wiki:- http://wiki.librecad.org
Forum:- http://librecad.org/cms/home/get-help/forum.html
News/Blog:- http://blog.librecad.org/
Repository:- https://github.com/LibreCAD/LibreCAD
Video Tutorial:- http://www.youtube.com/results?search_query=librecad
Don't have money? Don't worry. LibreCad is free. You don't have to purchase license or pay anything for using it. You can contribute if you want.
Don't know English? Don't worry LibreCad is available in many languages. And more are added in in continually.
you can use it, customize it, hack it and copy it with free user support and developer support from our active worldwide community and our experienced developer team.
Need to change your platform? Don't worry. LibreCADIs available on every platform. Just copy your files from old platform, paste it in new one and you're ready to go.
LibreCAD started as a project to build CAM capabilities into the community version of QCad for use with a Mechmate CNC router.
Since QCad CE was built around the outdated Qt3 library, it had to be ported to Qt4 before additional enhancements. This gave rise to CADuntu.
The project was known as CADuntu only for a couple of months before the community decided that the name was inappropriate. After some discussion within the community
and research on existing names, CADuntu was renamed to LibreCAD.
Porting the rendering engine to Qt4 proved to be a large task, so LibreCAD initially still depended on the Qt3 support library. The Qt4 porting was completed eventually during the development of 2.0.0 series, thanks to our master developer Rallaz, and LibreCAD has become Qt3 free except in the 1.0.0 series.