The war release of GvTags contains a WAR-file to be deployed on a servlet engine like Tomcat.
It contains all files needed to run GvTags. Also it contains the parts of Groovy to execute Groovy code.
It comes with a lot examples and test pages to show the power of GvTags.
GvTags is implemented according to JSP 2.0. So you must have Tomcat 5.0 or higher to install GvTags.