Offers the general-purpose 2D CAD program A9CAD supporing industry standar DWG and DXF drawing formats, and the DWG/DXF translator A9Converter, both free.
http://www.a9tech.com/
A parametric drawing and calculating utility, for creating diagrams of variable geometry objects. Writes DXF files and copies to office applications.
http://www.ransen.com/dexterpen/
Detailed instructions on how do design and draft pressure vessels with AutoCAD, with examples.
http://www.geocities.com/ww_chew/pvdrafting/pvd-frame.htm
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