What is Liferay IDE?
Liferay IDE is the official set of Eclipse plug-ins supporting development for the Liferay Portal application platform.
It is available as a set of Eclipse plug-ins installable from an update-site. The latest version supports developing 5 Liferay plug-in types: portlets, hooks, layout templates, themes, and EXT-style plug-ins. Liferay IDE requires the Eclipse Java EE developer package using either Galileo or Helios versions.
An Enterprise Edition (EE) version of the IDE called Liferay Developer Studio is also available to current or potential EE customers that includes support for Websphere and Weblogic server adapters.