A9Tech
- http://www.a9tech.com/
- Offers the general-purpose 2D CAD program A9CAD supporing industry standar DWG and DXF drawing formats, and the DWG/DXF translator A9Converter, both free.
VectorEngineer
- http://www.vectorengineer.com/
- A multi-purpose 2D CAD system for technical drawings, designs, and isometric visualizations. A free version is available for download.