Simple of using, very similar to AutoCAD which is the main reference CAD software in the market, FREE licensing option, excellent tool for making drawings and come to reality your ideas!

Ease of use, fast, intuitive, practical, POWERFUL, great interface, usually people are looking for a decent option to replace autocad; but NanoCAD is much better. The free version is the best of all free CAD software, and the pro version is even better than the autocad itself, there is no important function in autocad that this software does not have.

Most of all there is a 100% free version to you learn and use. It also uses .dwg extension which a lot of the other CAD software does not.