Pipes is a desktop system which analyzes an AutoCad(TM) drawing of a sprinkler system, checks for flaws and after these are eliminated, adds the size/diameter labels to the drawing. Tutorial: http://users.norwoodlight.com/janh/wink/autopipes-entry.htm
The PARSEC CEE is the primary achievement of several years of effort at NASA's Marshall Space Flight Center. The CEE was developed to allow engineers in the Advanced Concepts Department to rapidly prototype launch vehicle and spacecraft concepts.