oXygen is an XML editor that supports any XML document, and works with XML Schemas, DTDs, Relax NG schemas, and NRL Schemas. It has powerful transformation support that allows you to edit XSLT and XSL-FO documents and to obtain documents in the desired output format (such as HTML, PS, or PDF) with just one click. It also includes a complete Subversion client, support for flattening XML Schemata, an XML Schema instance generator, integration with the X-Hive/DB, MarkLogic and TigerLogic XML databases, editing actions on the diagram, and a rename refactoring action.
Schroedinger is the combination of Apache Tomcat with a nice, clean Swing GUI. It provides an easy way to create and test JSP and Servlet Web applications. It records every JSP/HTTP activity so that every possible bug can be corrected immediately. Schroedinger can be used in personal mode, which prevents others from using its JSP Server while you develop the application. Alternatively, Schroedinger's working directory can be opened via file-sharing, so that a JSP can be copied to any computer of the JSP development team.
The XhtmlValidator is a PHP class that can be used to validate XHTML documents. It uses only the expat extension functions, which are always available in PHP, so it does not need other external XML processing extensions. The class parses the documents and checks whether the tags and attributes used by the documents are allowed within the XHTML standard. If validation errors are found, highlighted error messages and offending document line numbers will be returned.
EditiX Lite is a powerful and easy to use XML editor, visual schema editor and XSLT debugger. It is designed to help Web authors and application programmers take advantage of the latest XML and XML-related technologies such as XSLT/FO, DocBook, and XSD Schema. It has real-time XPath location and syntax error detection, context syntax popups supporting DTD, Schema, and RelaxNG, and support for multiple templates and project management.