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
IronCAD is a powerful, professional-grade CAD software focusing on 3D modeling and mechanical design, while LibreCAD is an open-source, user-friendly option primarily aimed at 2D drafting. The two cater to different user needs; IronCAD is suited for complex engineering projects, whereas LibreCAD is ideal for simpler designs and technical drawings.