XQuery API for Java (XQJ)
DataDirect XQuery is an embeddable software product based on the XQuery and XQJ standards that enables Java developers to access both relational and XML data sources using a single XQuery query. Runs on Oracle, SQL Server, DB2, and more!
FLWOR - An Introduction to the XQuery FLWOR Expression
An XQuery FLWOR Tutorial, covering an introduction to the main constructs of the XQuery FLWOR expression, including: For, Let, Where, Order By, and Return. Written by the W3C's Dr. Michael Kay.
XQuery Editor
Stylus Studio's XQuery development tools are a tremendous help in building and testing XML applications requiring a standards-based approach to querying, integrating and transforming data from various distributed data sources.
XSLT Profiler
Stylus Studio's XSL and XSLT profiler allows you to create detailed XSLT performance metrics profiles of any stylesheet in a processor-independent way.