Based on a layout built with the YAML CSS Framework
Message Box CSS found on Janko at Warpspeed
Spinner Control for Prototype by Ken Snyder
Ajax Loading GIF Animation from ajaxload.info
The USCII-5x7-ENGLISH-C0 specification was generated using a single script in the Rebol language. If you want to look at how clean the specification and the code that manipulates it is, take a look at the source on GitHub.
When I first designed USCII, Rebol was not open source and I had a disclaimer up about not putting a lot of investment into a proprietary language. Two years later, Rebol was open-sourced. You can read some of why I think it is interesting in Why Rebol, Red, and the Parse dialect are Cool.