StrutsCX: Struts with Castor XML and XSLT by Bernhard Woehrlin
Stxx - Stxx is an extension to Struts, extending its existing functionality to help Action classes to return XML that will be transformed by an XSL file.
Struts XSLT Code Generator by Shengmeng Liu - An XSLT based code generator for Struts, completely based on the XSLT transformation and a set of stylesheet files. Ideally, users can customize the stylesheet for each type of Struts files to have templates of their own without having to access the source code and recompile it.
Boost Struts with XSLT and XML By Julien Mercay and Gilbert Bouzeid.
Velocity-Tools / Struts by the Velocity Team. (WAR zipped for download). Use Velocity templates with Struts 1.0 and beyond! This is the sample WAR from a recent CVS snapshott. Just autodeploy, and see for yourself!