Stylus Studio: XQuery Tools - Development tools for editing, mapping, debugging, and profiling (benchmarking). Xcache Rainbow Project - A web-based XML query engine and tools, which use a cache of results from previous queries. XQuantum Database - Cognetic Systems' research implementation (in Java) of a subset of XQuery, along with its type inference system. XQuench - A project to create an open-source XQuery parser and engine in Java. Xquery Lite - A query language for XML, based on XQuery 1.0. Includes an implementation for PHP. Qexo (Kawa-XQuery) - A partial implementation of XQuery. It compiles queries down to Java bytecodes using the Kawa framework. oXygen XML Editor / XQuery Debugger - XML Editor with editing and debugging support for XQuery. Allows XQuery execution against multiple XML databases: eXist, Berkeley XML DB, X-Hive, MarkLogic, TigerLogic. BaseX - Open-source XML database engine and XPath/XQuery 3.0 Processor with support for the W3C Update and Full Text extensions. XQilla - An XQuery and XPath 2 library and command line utility written in C++, implemented on top of the Xerces-C library. XQJ API - Provides free XQuery API for Java implementations for XML databases such as MarkLogic, eXist, BaseX and Sedna.