XSL Lint
- A semantic lint checker for that detects poor syntax and redundant areas of a stylesheet.
- http://nwalsh.com/obsolete/xslint/

UWOBO XSL Processor
- Invoked via URL giving the URI of an XML document and a list of stylesheets to be applied. Requires Tomcat and Xerces/Xalan.
- http://helm.cs.unibo.it/uwobo/

Jade
- An early implementation of an XSL processor. Converts XSL to DSSSL to render XML.
- http://www.cogsci.ed.ac.uk/~ht/xslj.html

MSDN's XSLT Developer's Guide
- The successor to Extensible Stylesheet Language (XSL), XSL Transformations (XSLT) is an XML-based language that enables you to transform one class of XML document to another
- http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xmlsdk30/htm/xmconxsldevelopersguide.asp

XSL Transformations (XSLT) Version 1.0
- This specification defines the syntax and semantics of XSLT, which is a language for transforming XML documents into other XML documents. (W3C Recommendation 16 November 1999)
- http://www.w3.org/TR/xslt

Jeni's XSLT Pages
- Jeni Tennison is a very active XSLT community member. This page is her homepage for her many XSLT activities. With 25 tutorials/articles and 2 utilities for visitors. Good website.
- http://www.jenitennison.com/xslt/index.html

XSLT Requirements Version 2.0
- This draft document describes the requirements for the XSLT 2.0 specification. (W3C Working Draft 14 February 2001)
- http://www.w3.org/TR/xslt20req

TopXML XSLT Zone
- With 34 original articles, the XSLT Zone explains XSLT in various solutions - such as .NET, mobile solutions and in applications. These articles range from introductory to advanced; through to tutorials and include complete XSLT and XPath references.
- http://www.topxml.com/xsl

XML Cover Pages: Extensible Stylesheet Language (XSL)
- Introduction, history, articles and software support by Robin Cover. (Oasis)
- http://www.oasis-open.org/cover/xsl.html