Use the Ace Code Editor from Concrete5 7.x in your 6.x sites.
Unit of measure calculator
During the course of creating product catalogues, the need often arises to work out the unit of measure for a product. Surpised that such a thing didn't already exist online, I've made my own!
The first version was quickly pieced together as a proof of concept which was in use for several months. When I revisited the code to expand the options, I decided to completely rewrite it to take advantage of the template rendering of Underscore.js and standardised the form elements with Bootstrap 3.