JBoss Tools is an umbrella project for a set of Eclipse plug-ins that supports JBoss and related technologies; there is support for {product-title}, Hibernate, JBoss AS, Drools, jBPM, JSF, (X)HTML, Seam, Maven, JBoss ESB, JBoss Portal and more.
Visit http://tools.jboss.org/documentation/howto/#developing-apps-for-the-cloud to get started.