http://nanocad.com

nanoCAD and nanoCAD Plus

• nanoCAD is a professional grade CAD tool. It has a familiar interface, powerful drafting and design tools, native DWG compatibility, and an open API. And it's totally free to use and share. No catches, no gotchas, and no compromises.
• nanoCAD Plus is everything nanoCAD is, and more. It includes even more productivity features, and is available through a low-cost annual subscription, including updates and priority online support. No frills, pure design.