GSP are not maintained as a standalone module. But it has been forked and reintegrated in Grails.
GSP(GroovyServer Pages) is similar to JSP(JavaServer Pages).
- Error rendering macro 'link' : Link needs a name and a URL as arguments.
GSP Module Project has started originally by Troy Heninger.
Troy's GroovyPages project page is http://www.investortech.com/emp/troy/groovypages.htm
The original sources of GSP module 1.1 can be found at Groovy CVS: http://cvs.groovy.codehaus.org/viewrep/groovy/modules/pages/src/main/groovy/modules/pages
Now here is a new GSP progect page: https://gsp.dev.java.net/