Designed with Freehand and developed with Flash, starting with version 4 in 1999. These apps have a lot of internet dust on them and were a huge challenge but very rewarding.
All these apps were connected to a back-end server for generating materials and supplies lists to install.
Ceramic Tile Estimator for Armstrong.
Ceiling planks or acoustic ceiling tiles
The apps were easily rebranded..
Estimate concrete amounts for various non commercial applications.
One of the original, wallpaper calculator.
The Paint Calculator was the DIY's original calculator (OC) and it was at a time when Flash didn't have a square root math function, so we DIY'd our own.

I actually have a number of these apps, still running.. Let me know if you would like to test drive them.  :-)