General Actions:
The HttpClient component supports the client-side of RFC 1945 (HTTP/1.0) and RFC 2616 (HTTP/1.1) , several related specifications (RFC 2109 (Cookies) , RFC 2617 (HTTP Authentication) , etc.), and provides a framework by which new request types (methods) or HTTP extensions can be created easily.
XWiki Rendering - Transformation - WikiWord
Logback: the generic, reliable, fast and flexible logging library for Java.
dom4j: the flexible XML framework for Java
Infinispan core module
Woodstox is a high-performance XML processor that implements Stax (JSR-173) and SAX2 APIs
Apache Ant
XWiki Commons - Management
Updates the Link State cache when a document is modified
Rendering macro for generating footnotes
Contains stuff common to server and client
JDOM is, quite simply, a Java representation of an XML document. JDOM provides a way to represent that document for easy and efficient reading, manipulation, and writing. It has a straightforward API, is a lightweight and fast, and is optimized for the Java programmer. It's an alternative to DOM and SAX, although it integrates well with both DOM and SAX.
XWiki component for rendering charts into images
XWiki Commons - Logging - API
XWiki Rendering - Api
The type library and the precompiled Java interfaces of the UDK API.
XWiki Platform - Cryptographic Services
pygments
XWiki Commons - ClassLoader - API
Content Repository for Java technology API. Specifies a standard API to access content repositories in JavaTM 2 independently of implementation.