• CLEditor
  CLEditor is an open source jQuery plugin which provides a lightweight, full featured, cross browser, extensible, WYSIWYG HTML editor that can be easily added into any web site.
  

• Highslide JS
  ... is an open source JavaScript software, offering a Web 2.0 approach to popup windows. It streamlines the use of thumbnail images and HTML popups on web pages. Is licensed under a Creative Commons Attribution-NonCommercial 3.0 License.
  

Please remember, you need the author's permission (visit site) to use Highslide JS for a commercial website.

• jQuery JS
  jQuery is a fast, concise, JavaScript Library that simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages. jQuery is designed to change the way that you write JavaScript.
  You may use any jQuery project under the terms of either the MIT License or the GNU General Public License (GPL) Version 2.
  

• jQuery UI
  jQuery UI provides abstractions for low-level interaction and animation, advanced effects and high-level, themeable widgets, built on top of the jQuery JavaScript Library, that you can use to build highly interactive web applications.

• php.js
  php.js is an open source project that brings high-level PHP functions to low-level JavaScript platforms such as web browsers, browser extensions ( Mozilla/Firefox, Chrome ), AIR, and SSJS engines like V8 (node.js, v8cgi), Rhino, and SpiderMonkey (CouchDB).

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