Live.js – one script closer to designing in the browser
Say goodbye to Alt-Tab. Live.js makes sure you're always looking at the latest version of the page you're working on, whether you're writing HTML, CSS or Javascript.
Shadowbox
Shadowbox is a web-based media viewer application that supports all of the web's most popular media publishing formats. Shadowbox is written entirely in JavaScript and CSS and is highly customizable. Using Shadowbox, website authors can showcase a wide assortment of media in all major browsers without navigating users away from the linking page.
License
Shadowbox is licensed under the terms of the Shadowbox.js License. This license grants personal, non-commercial users the right to use Shadowbox without paying a fee. It also provides an option for users who wish to use Shadowbox for commercial purposes. You are encouraged to review the terms of the license before using Shadowbox.
http://www.shadowbox-js.com/