XulBooster is an Eclipse Feature adding XUL support to the Eclipse IDE and WTP. The Feature includes Editors, Views, Wizards, Snippets, Help, Builder etc. you can develop with it firefox extension, xulrunner application for example.
The builder plug-in project consists of an Eclipse plugin which automates the application of a modified GoF Builder pattern to a target POJO, thus converting the POJO into an immutable object which can improve thread safety in concurrent applications