Interesting, I see many posts promoting their own ssytems, but nothing for Linux or UNIX systems. It appears I must wait for someone to put some common sense in their heads and develop something that we all can use. I moved from Microsoft to Linus (unix) for a very good reason, Microsoft is far too susceptible to attack by cyber-terrorists. I suggest you take a look at http://www.us-cert.gov/ and http://www.cert.org/ and make up your own minds. I, long ago, became troubles with my microsoft 2000pro failing me due to malware attacks, thus, I use PCLinuxOS2007 (have not yet seen fit to upgrade to PCLinuxOS 2009 or 2010 as yet). Until developers see fit to develop useful drafting and design systems for Linux and/or Unix, I will depend on my hand drawn sketches and a complete word description as I did when I wrote "scope of Work" when working in the industry. I was a Principle Mechanical Designer with Parsons Engineering Corporation, Power and Petrochemical Division (SIP), in Houston, Texas. I retired April 1, 1998, hand have been volunteering my knowledge and experience within Sustainability Engineering ever since. When I did work, I found all CAD systems used by industry (Autodesk being the primary) to be a rip-off for industry. Greed is way beyond reason. For my current work please see http://chtank.org/. It seems software developers are more interested in an income to become the new Aristocracy rather tahn the survival of humanity.