progeCAD Smart! is a free CAD software for personal use that allows reading and writing of DWG, DXF, and PDF files. It has a similar interface, commands, and icons as AutoCAD and offers features such as Express tools, IntelliCAD AutoLISP interpreter, and raster image embedding.

Users can benefit from IntelliCAD AutoLISP interpreter, temporary point snap (like oSnap), layers, blocks, hatch, block, and xref editing. The software also offers 3D shading and rendering options. Moreover, it provides an optional approximate 10000 Symbols ALE library for users to access.
However, business users should opt for the progeCAD Professional package at www.caddit.net instead of relying on the free version. It's a long-awaited successor to progeCAD Smart! 2008. Smart! is a fully functional and powerful DWG-based software that supports CAD designing. It derives its features from the professional codebase of progeCAD.
Additionally, the software is easy to learn, simple to install, and intended for use by non-profit organizations, students learning CAD, teachers, and hobbyists. Free tutorials for progeCAD IntelliCAD are provided at caddit.net/intellicad/tutorial/. The users can also participate in discussions regarding the product at caddit.net/forum/.
Version 9.0.28.8: New high performance Auto CAD style software reads and writes DWG and provides similar interface.