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Construction notes manager, Open Source curve tables, Open Source turning path simulation, profile drafter, Open Source grading plan aids, and much, much more. That's HawsEDC--making AutoCAD work for you.
HawsEDC is a sole proprietorship of Thomas Gail Haws providing:
Free downloads of the Full HawsEDC Tools for AutoCAD as described on this site are available here.
Full HawsEDC Tools
This is the full-featured version. It works no-questions-asked for 60 days after install. Then it continues indefinitely in "nag" mode until you either ask for an extended trial or purchase a license.