**dat.gui** is a lightweight controller library for JavaScript. It allows you to easily manipulate variables and fire functions on the fly. Check the [index page](http://dataarts.github.com/dat.gui/) for usage. Initiated by [George Michael Brower](http://georgemichaelbrower.com/) and [Jono Brandel](http://jonobr1.com/) of the Data Arts Team, Google Creative Lab.