There is also rattleCAD app developed by Manfred Rosenberger.[0] rattleCAD <= 3.x was fully free & open-source, but actually rattleCAD 4.0 is proprietary with

There is also rattleCAD app developed by Manfred Rosenberger.[0] rattleCAD <= 3.x was fully free & open-source, but actually rattleCAD 4.0 is proprietary with freeware/demo version & few subscription modes.[1] [0] http://www.rattlecad.com/ http://www.rattlecad.com/ [1] http://www.rattlecad.com/download.html http://www.rattlecad.com/download.html