Marv Klotz's Utilities
Subtitled:
Software for people who Build Things!; this is an excellent collection of quick little utilities for basic mechanical and machining calculations.
Last update as of this writing was April 5th, 2006 so it is maintained and kept current.
Lots of good links too -- this is an amazing resource!
Posted by DaveH at April 26, 2006 7:36 PM