nanoCAD is a professional and simple CAD software, with full *.dwg support. Developed by Nanosoft
License: Freemium
Apps available for Windows
NaroCAD is a fully fledged and extensible 3D parametric modeling CAD software.
License: Open Source
nanoCAD is a more feature-rich CAD software with a focus on professional use, offering extensive tools for 2D and 3D drafting, while NaroCAD is a lightweight and free alternative best suited for basic CAD tasks with a simpler interface.