BaseX is a light-weight, high-performance, and scalable XML database system and XPath/XQuery processor, including full support for the W3C Update and Full Text extensions. An interactive and user-friendly GUI frontend gives you great insight into large XML data instances. It is platform independent and works out of the box.
Java XML XPath - Eclipse Templates is a set of 24 Java editor templates for easily working with XML documents in Eclipse. It lets you just type XML in any Java editor and select what you want to do with the XML document. It uses the DOM parser provided with the JDK, so there is nothing more to install. Instructions, templates, and examples for using XPath are included along with three cheat sheets for working with the DOM and XPath.
XML Parsing in Java Kit is an Eclipse plug-in composed of three parts: cheat sheets, visual XPath, and XML templates. The cheat sheets describe Parsing XML in Java, with descriptions of using the DOM parser, validating documents, using XPath, character references, etc. An interactive example of using XPath expressions is included. Visual XPath is an XPath expressions visualizer. It lets you evaluate XPath expressions, and highlights the corresponding parts of the XML document of your choice in response. The XML templates can be useful for working with XML documents with a Java editor.
Xidel is a command line tool to download Web pages and extract data from them. It can download files over HTTP/S connections, follow redirections, links, or extracted values, and process local files. The data can be extracted using XPath 2.0, XQuery 1.0, and JSONiq expressions, CSS 3 selectors, and custom, pattern-matching templates that are like an annotated version of the processed page. The extracted values can then be exported as plain text/XML/HTML/JSON, or assigned to variables to be used in other extract expressions or be exported to the shell. There is also an online CGI service for testing.
betterFORM is an implementation of the W3C XForms 1.1 Recommendation. It allows easy creation of highly dynamic Web 2.0 user interfaces with attractive controls and layout. You can add validations, calculations, actions, and events to build complete Web applications in a declarative way.
eXist is a native XML database featuring efficient, index-based XQuery processing. It provides a complete ecosystem for building applications entirely based on XML, XQuery, and related standards. The high-performance XML database engine stores textual or binary data and documents without requiring a database schema. Using XML across all layers makes mapping technologies superfluous and increases productivity. A browser-based IDE and a standardized application packaging system help developers get started quickly.