Solid|matter is a 3D CAD application for product design. It is planned to feature parametrical, solid-based modeling, a sketcher with associative dimensions, and basic simulation of assembly kinematics. It is also designed to integrate well with the Gnome desktop.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.