Struts PlugIn allows the programmer to enhance their web applications. There are many PlugIns available for struts e.g. Struts Tiles PlugIn, Struts Hibernate PlugIn, Struts Spring PlugIn etc. Beside these available PlugIn you can create your own PlugIn. Read More at: http://www.roseindia.net/struts/developing-struts-plugin.shtml