GvTags is a lightweight yet powerful tag library and template engine for the dynamic programming language Groovy. The tag library can be used to generate Web pages with powerful tag support. It can be used with the template servlet of GvTags (TagTemplateServlet) or with JavaServer Pages (JSP). The template engine can be used to generate any kind of text documents. Since it is written in Groovy and compiled to a Java class file, it can be used from Groovy as well as from Java.