LibreCAD is a free, Open-Source CAD application for Windows, Mac, and Linux. Support and documentation is free from our large, dedicated community of users, contributors, and developers. You, too, can get involved!
What's new in LibreCAD
Shift would not activate the command line
Command+Tab didn't always activate the current drawing on OS X
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While I felt the app is actually pretty good for quite extensive models as well, aspects such as annotation and some arc configurations are not as easy to perform. Personally, while this app provides most of the options given by paid CAD services such as AutoCAD, the layout of the whole software may require a bit of intensive thinking.
I was pretty ticked several years ago when the developer of QCad basically took the product closed source. Since then, I've happily been using SketchUp, but I've very glad to see that another group has brought this app back to life. I don't have a good project right now to take it for a test drive, but it looks great. Good luck!