4XSLT
A component of the 4suite collection. A XSLT Processor written in Python by FourThought LLC [Open Source].
DataPower Products
DGXT is an optimized software-based XSLT interpreter that is cross-platform and fully compliant with the current XSL specification. The XA35 XML Accelerator is a hardware-based solution that speeds XSLT, XPath, XSD (Schema validation) by 30X or more [Commercial].
Ecrion XF Rendering Server
Uses XSL formatting objects to dynamically create customized PDF, POSTSCRIPT, HTML, GIF, JPEG, or PNG files from XML data [Commercial].
Microsoft XML Core Services 4.0
http://msdn.microsoft.com/downloads/default.asp?url=/downloads/sample.asp?url=/msdn-files/027/001/76
Contains an XSLT engine, which fully implements the XSLT standard [Freeware].
PassiveTeX
A library of TeX macros which can be used to process an XML document which results from an XSL transformation to FO (formatting objects) [LaTex].
Sablotron
Sablotron is an attempt to develop fast, compact and portable XSLT processor. Supported platforms: Linux, Windows NT and Solaris [Open Source, GPL].
Scriptura
A letter, report, and output generator for XSLT/XSLFO documents. GUI Designer for stylesheets, plus an Engine to create XSLT, XSLFO, PDF, XHTML, and PCL5. [Commercial].
ShoXS: a Shorter XSL Syntax
ShoXS is a Shorter Syntax for XSL and this site provides some tools to read XSL files, convert and edit in ShoXS then convert back and save in XSL [Open Source, GPL].
The SAXON XSLT Processor
Java XSLT processor developed by Michael Kay [Open source, MPL].
Unicorn XSLT Processor
XSLT processor for Windows written in C++ [Freeware].
Xalan-C++
XSLT Processor written in C++. A part of Apache's XML project [Open Source].
XML/XSL Portal
This site provides a significant number of utilities and downloads for XSLT and related developers. Quite advanced in its own use of client-side XML it's unfortunately not available to non-IE5+ browsers.
XML::XSL
A server side XSLT processor written in Perl [Open source, GPL].
XSet
An XML property set description of XML 1.0 and XML namespaces that enables XPath based indexing and addressing of the full fidelity grove of an XML document.
XSL Processor for ColdFusion
CFX Tag allows you to perform XSL Transformations with ColdFusion. Free developer edition, commercial sites must purchase a license per server.
XSL stylesheets for TEI XML
A set of XSLT specifications to transform Text Encoding Initiative (TEI) XML documents to HTML, and to XSL Formatting Objects (XSL-FO).
XSL Template Designer
Includes a Windows GUI that simplifies designing layouts for complex XML forms and a runtime Engine that merges a layout with XML data to produce a PDF via XSL-FO [Commercial].
XSL Trace
A tool that allows stepping through XSL scripts showing the transformation rules as they are created and the XML or HTML as it is generated.
XSL Transformations (XSLT) in Mozilla
Information about Mozilla's native XSLT processor. Includes a FAQ and a list of known bugs.
xsl:easy
Transformation tool using built-in graphical XSLT editor to create XML out of arbitrary data and save the transformation result back to other formats [Commercial].
XSplit
Takes standard HTML file and splits it automatically into two related XML files. The first file contains the content definition (DTD), the second contains the format definitions for that page. Once split, the static formatting (XSL) can be applied to new XML content files.