The purpose of XSLTunit is to provide a unit testing framework for XSLT transformations similar to the "*unit" environments available for other languages (i.e. Junit for Java).

An optimizing XSLT compiler for Java, which turns stylesheets into binary Java classes.

A powerful editor with XSLT processing and debugging capabilities. You can run an XSLT processor on the Emacs buffer you edit, and view the results either in another Emacs buffer or in a browser.

Tool to debug XSL transformations which is part of Stylus Studio. [Commercial]

The XSLTDoc Application helps you to browse and understand XSLT stylesheets. It shows summaries of stylesheets and explains each XSLT instruction in detail. This page also has several other useful utilities.

A couple of online utilities for converting XML and DTDs to XSL.

TestXSLT is the Apache Software Foundation's Xalan Java XSLT processor packaged for the Mac! Also on this page are JSP XML tags and a small class for JAXP developers.

Unsupported XSL processor written in Java, using the Simple API for XML (SAX 1.0) and the Document Object Model (DOM 1.0) API. This package also contains xslSlideMaker, a post-processor that can quickly make slides and multi-level slides with XML &...

Libxslt is the XSLT C library developed for the Gnome project. Libxslt is based on libxml2 the XML C library developed for the Gnome project. It also implements most of the EXSLT set of extensions functions and some of Saxon's evaluate and expressions...

free servlet that uses XSLT to converts XML source into content (HTML, WML, XML, ...) viewable for the device.