From the Author:
Word² (wordsquared) is the world's first Massively Multiplayer Online crossword game! It pits wordcrafters against one another in real time on an infinitely large game board. Rack up high scores by building the longest chains of words, but watch out: everyone else is playing alongside you, and what they do may surprise you!
WebSockets, SVG (via Raphael.js), HTML5, CSS3, CoffeeScript, jQuery.