Hyphenator.js … automatically hyphenates texts on websites if either the webdeveloper has included the script on the website or you use it as a bookmarklet on any site.
Javascript that implements client-side hyphenation of HTML-Documents
A JavaScript library for image- and vector-tiled maps using SVG.
This jQuery plugin provides a means for a developer to visually connect elements on their web page, in much the same way you might have seen on Yahoo Pipes. It uses Canvas in modern browsers, and Google's ExplorerCanvas script for stone-age browsers. Full transparent support for jQuery dragging is included, and the API is super simple.
Helium is a tool for discovering unused CSS across many pages on a web site. The tool is javascript-based and runs from the browser.
Gordon: An open source Flashâ„¢ runtime written in pure JavaScript