Red Hat Enterprise Linux - produced by Red Hat
SUSE Linux Enterprise Server - produced by Novell
Ubuntu (available free of charge, but has paid support available) - produced by Canonical.
Yes. Several CAD suites have versions for both Windows and Linux, including:QCad (commerical and GPL versions)NX (commercial)BRL-CAD (GPL)AutoQ3D (GPL)Abaqus (commercial)gCAD3D (proprietary freeware)Archimedes (GPL)
AutoCAD is not developed for Linux. Some versions will run in Wine, but most recent versions will not.
They don't.
Linux is open source, not shareware or proprietary. There are commercial Linux distributions.
iwconfig
Distributions
"Distros", or distributions.
Commercial versions will usually have support agreements and help hotlines to assist you / your company in any issues you might encounter. A gratis distro is usually limited to whatever help is available on the distro's forums.
No.
Active Server Page, or ASP, is a Microsoft language. So, the most common answer is Windows. Linux will support some versions of the ASP language, but there are better alternatives for Linux, such as PHP.
Yes. Older versions primarily used wxWidgets, a cross-platform widget toolkit. Newer versions use Qt, another cross-paltform toolkit.
Some versions of CorelDRAW can be run on Linux using Wine, while others can't.