LibreCAD is a free Computer-aided design (CAD) application for 2D design. It works on Linux, OS X, Unix and Windows operating systems. Developed by Ries van Twisk
License: Open Source
LibreCAD is a free, open-source tool focused on 2D drafting, making it accessible for basic design needs. In contrast, Autodesk Inventor is a professional-grade software with advanced 3D modeling, simulation, and parametric design capabilities, targeted towards industrial applications.