Autocad/Studioworks or any other as good opensource/linux variant.
The BRL-CAD package is a powerful Constructive Solid Geometry (CSG) solid modeling system with over 20 years development and production use by the U.S. military. BRL-CAD includes an interactive geometry editor, parallel ray-tracing support for rendering and geometric analysis, path-tracing for realistic image synthesis, network distributed framebuffer support, image-processing and signal-processing tools. The entire package is distributed in source code form.
*bow*
License: BSD License, GNU General Public License (GPL), GNU Library or
Lesser General Public License (LGPL)
Mind blowing :-)
A query though, i'm a complete newbie at CAD and its technicalities, therefore i ask : If this thing has been there for over 20 years and has been GPL(though i don't know since how long, but definitely 2004-04-27 14:22 or earlier, as that's the date timestamp of their first commit on sourceforge) then why are people still harping about no FOSS CAD tool existing.
Regards,
- vihan