If you're not familiar with Groovy and Grails, follow the links above and take a look at my recommendations for reading material, to learn more.  Groovy and Grails are built on top of the Java platform. Groovy is a dynamic language with very tight integration with Java.  Grails is a web-development framework, inspired by Ruby-On-Rails.  Grails provides a very fast, 'low friction' development enabling you to get from concept to initial working code quickly, but has enough depth to turn the prototype into a deployable, enterprise-class application.  And of course, because Groovy and Grails integrate seamlessly with the Java platform, you have direct access to all the enterprise Java software out there.