NetBeans Plugin

Groovy is supported natively in NetBeans IDE from NetBeans IDE 6.5 onwards.

How To Get Started

A Groovy editor is a standard part of the "Java" distribution, i.e., the distribution aimed at Web development. Also included in that distribution is support for Grails.In this section, we create a Java application.Click here to download the "Java" distribution, 6.5 or above:

http://www.netbeans.org/downloads/index.html

Creating a Groovy Application

Here is described how to use Groovy in NetBeans IDE:
http://www.netbeans.org/kb/docs/java/groovy-quickstart.html