Javascript libraries


 * Script.aculo.us
 * Prototype
 * jQuery

Photo galleries

 * FancyBox - MIT License
 * Lightview - not commercial under Creative Commons by-nc-nd License, commercial under Creative Commons by-nd License. (used commercially)
 * Color box - MIT License. (used commercially)

Other

 * Ajaxload Ajax loading gif generator; Generated gifs are totally free for use
 * Autocomplete - MIT/GPL
 * Cufon javascript font library. - free