Archimedes is a free and open source CAD (Computer Aided Design) software. It is a robust system built over Eclipse’s Rich Client Java Platform fully based on plug ins. This means it is easily extensible but also has a pretty thin core that allows you to select the features you...
The project seems no longer developed. Last version, 0.66, released in June 2012, can be still downloaded from SourceForge.
Cobalt is a parametric 3D modeling software for product design and development that's easy to use. It offers wireframe, solid and surface modeling with precision drawings, renderings and animation.
Graphite is an easy to use precision 2D/3D CAD software for product design and development. Formerly known as Vellum, Graphite offers extremely powerful, precision wire-frame drafting with the elegant ease-of-use that makes it productive even when only used occasionally.
SAMoCAD designed to create simple drawings, primarily to architectural drawings. Development of the program is far from complete, but it is already possible to draw. There is partial DXF format support, at the moment almost all drafted in the program can be saved in DXF and can...
Formerly Vellum Solids, Xenon™ is an associative 3D modeling software for product design and development that's easy to use. It offers history-based wireframe, solid and surface modeling with precision drawings, renderings and animation.
Argon™ is a CAD and 3D precision modeling software for Mac and Windows. It offers wireframe, solid and surface history-free modeling with precision drawings, photo-realistic renderings and animation.