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If you haven't tried it yet, DodoCAD is a package of Free (GPL)
AutoCAD utilities. The project also serves as a framework for further
development of these tools, detail libraries, and drawing standards,
especially as used in Architecture and Engineering (A&E).
There are a lot of improvements this time around as we continue to
incorporate code from the unrefined tools we've written over the
years. Give it a test and mail us with flames and suggestions.