GwtQuery a.k.a. gQuery is a jQuery-like API written in GWT. It offers the possibility to use the jquery api in gwt projects.
gQuery offers a set of plugins to enhance your gwt projects, and it also allows to easily rewrite (port) jquery-code and jquery-plugins for gwt.
gQuery additionally's plenty of features like its Type safe system, its Ajax api, and its data-binding handling, which make that to consume 3party services were much easier than using RequestBuilder.