HeeksCAD is a free, open source, CAD application to help you with your work. HeeksCAD is an easy to use CAD application. Functionality: Import solid models from STEP and IGES files. Draw construction geometry and lines and arcs. Create new primitive solids, or make solids by extruding a sketch or by making a lofted solid between sketches. Modify solids using blending, or boolean operations. Save IGES, STEP and STL. Printer plot the 2D geometry or to HPGL. Import and export dxf files; lines, arcs, ellipses, splines and polylines are supported. Use the geometric constraints solver to create accurate drawings from rough sketches.

HeeksCAD can be translated into any language. There are currently English, German, and Itallian translations.
HeeksCAD has been built for Windows, Ubuntu, Debian, and OpenSUSE.
see the Wiki tab for details
It is possible to make Add-In modules, see HeeksCNC, HeeksArt, and HeeksPython projects.

The license of this software is Free, you can free download and free use this cad software.