GXTCore is an open source project and application that uses open source tools built on the Java platform (Google Web Toolkit, ExtJS, Spring and Hibernate) to help you develop Web 2.0 applications quickly and efficiently. It was originally developed to eliminate the ramp-up time found when building new web applications for customers.
By using this tool, you are given the ease in building a web application because you do not need to develop user and profile management. You only need to develop additional modules according to user needs.
You do not need to worry with the performance of this application, with the support of AJAX, this application can be used in some Internet browser with a high speed.