Grails are an American instrumental rock band from Portland, Oregon. Their sound brings to mind bands like Dirty Three, Godspeed You! Black Emperor, Faust, Gong and Pink Floyd.

Allegedly saurian-type "alien" entities which are said to be somewhat taller than the usually encountered "grays", with extremely thin, 'rail-like' torsos and limbs. Reportedly possessed of near superhuman strength.

Grails is an open source web application framework for high productivity. It's based on the Groovy programming language and is part of the Java platform. Grails has been created to attract new users to the Java platform and to give Java developers capabilities for building web based applications that never have been available before.