Grails aims to bring the "coding by convention" paradigm to Groovy. It's an 
open-source web application framework that leverages the Groovy language and 
complements Java Web development. You can use Grails as a standalone 
development environment that hides all configuration details or integrate your 
Java business logic. Grails aims to make development as simple as possible and 
hence should appeal to a wide range of developers not just those from the 
Java community.

WWW: http://grails.org
