Based on the QCAD software libraries, LibreCAD is another CAD for 2D drawing released under the GPL license. Most of the menus and commands in LibreCAD are very similar to those of AutoCAD, making it a particularly easy-to-use program for all those users already used to using it. LibreCAD allows you to import only files in the DXF format, however, to export files, it allows you to use numerous other formats.

With tools for solving common numerical problems in linear algebra, root-finding of nonlinear equations, integration of ordinary functions, polynomial manipulation, integration of algebraic differential equations, and graph generation, which is very attractive to anyone using this software. Its fundamental data is the matrix; it integrates compatibility with complex numbers and includes a powerful and extensive library of mathematical functions, which can be extended through user-defined functions.

It's extremelly configurable, and extensible