Web Toolkit - provides a component-based approach to building markup-driven applications (not Struts specific). Alternative to the Template and Tiles taglibs.
Nested Taglib [Also included in Struts 1.1] by Arron Bates - More efficient markup of beans and their nested children (linked site provides library for previous struts versions).
REGEXP.VALIDATOR.STRUTS by Emmanuel Boudrant - A validation component that works with Struts 1.0, to manage form validation on server-side and client-side.
Struts-WAS.jar by Christopher Assenza - Modified Struts 1.0 JAR for Websphere 3.5 or 4. Zipped for download. (For additional tips regarding Websphere 3.5 see http://jakarta.apache.org/struts/installation-was352-x.html.)
Struts Layout by Improve - An extension library to improve interfaces creation with Struts.
Indexed Tags [Also available in the nightly build] by Dave Hays - Produce indexed names such as <input type="text" name="parameter.value" value="Mac">. Link, Submit, and Select tags are included too.
LinkParam Tag by Eric Fesler - Multiple request parameter for the html:link tag.
Struts IF/THEN/ELSE and SWITCH tags by Niall Pemberton.
TextArea Wrapping by Matthias Bauer. Patch to HTML:TextArea tag to provide wrapping of long lines.
RowTag (ZIP file for download) by Amarda Business Systems Ltd - Source for a Struts-compatible tag to generate alternating row colors in a table by Niall Pemberton. [NOTE: Requires a Struts build dated after 2001-04-28]
Grid tag by Jeff Trent - write grid-style JSP code.