This is a list of independently maintained third-party open-source projects whose code is used by or included in WordPress 3.2 (which, as of June 2011, is in development).

Used

• Class POP3 by The SquirrelMail Project Team.
• Color Animations. “Adds the ability to do color animations to jQuery 1.2 and newer”
• Horde Text Diff. “Engine for performing and rendering text diffs”
• imgAreaSelect. “A jQuery plugin for selecting a rectangular area of an image”
• Jcrop. “The jQuery Image Cropping Plugin”
• jQuery. “Α fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development”
• jQuery Hotkeys. “[A] plug-in that lets you easily add and remove handlers for keyboard events anywhere in your code supporting almost any key combination.”
• jQuery serializeObject.
• jQuery UI.
• jQuery UI CSS Framework.
• kses. “HTML/XHTML filter that only allows some elements and attributes”
• PclZip. “Compression and extraction functions for ZIP archives”
• PemFTP. “An FTP implementation in pure PHP”
• PHPMailer. “Α PHP email transport class”
• Portable PHP password hashing framework. “A portable public-domain password-hashing framework for use in PHP applications”
• SimplePie. “Α very fast and easy-to-use class, written in PHP, that puts the ‘simple’ back into ‘really simple syndication’”
• SWFUpload. “A small JavaScript/Flash [upload] library to get the best of both worlds”
• The Incutio XML-RPC Library for PHP.
• Thickbox. “One Box To Rule Them All”
• TinyMCE. “A platform-independent web-based Javascript HTML WYSIWYG editor control”

Bundled/Deprecated

• Cropper. “JavaScript Image Cropper UI, using Prototype & script.aculo.us”
• MagpieRSS. “[A]n XML-based (expat) RSS parser in PHP”
• Prototype. “A JavaScript Framework that aims to ease development of dynamic web applications”
• script.aculo.us. “Easy-to-use, cross-browser user interface JavaScript libraries”
• Snoopy. “The web client class for PHP”

Other

• WordPress DB Class.
• force_balance_tags().

Todo

• http://core.trac.wordpress.org/browser/trunk/wp-includes/script-loader.php ‹ Check against this.