Jquery-fontchanger is a project mainly written in ..., it's free.
Change fonts to sort out your typography with this jquery plugin. Brute Force Typography.
FontChanger v0.9 Project site: github.com/glensm/jquery-fontchanger Copyright 2011 Glen Smith
Author: Glen Smith Twitter: @glensm Site: glensm.com
Description: Puts the guess work back into typography. Sometimes mostly late at night when you just can't think of what fonts to use. This minimal plugin solves that problem for you. It lets you cycle through a default list of fonts and you can also add your own.
How to use it:
To start it up use the following code:
$('body').fontchanger(options);
You can add you own fonts by putting an array where options is above.
$('body').fontchanger(["Museo","anonymous"]);
Use the left and right keys on your keyboard (a keyboard is required) to cycle through the fonts.