The free version of the Russion KOMPAS-3D MCAD software can be found at http://www.ascon.ru/english/download.php . Assembly modeling is not possible with this version and commercial use is not allowed.
On http://www.solidedge.com/free2d you can download a free 2D version of Solid Edge. This is not based on IntelliCAD and inherits some of the additional "intelligence" of the Solid Edge 3D MCAD software. Support is not free and the company probably assumes it can lead users to evaluate and grow up to Solid Edge 3D. Only for Windows XP and you need to use Internet Explorer to download it. (read in upFront.eZine NEWS #486)