Errai:
http://erraiframework.org/
https://docs.jboss.org/author/display/ERRAI/Errai+UI

gwtbootstrap:
http://gwtbootstrap.github.io/
https://github.com/gwtbootstrap/gwt-bootstrap
https://github.com/gwtbootstrap/gwt-bootstrap/issues/448

https://github.com/gwtbootstrap3/gwtbootstrap3
http://stackoverflow.com/questions/22836186/gwt-bootstrap-vs-gwtbootstrap3

Layouts:
http://www.gwtproject.org/doc/latest/DevGuideUiPanels.html

DockLayoutPanel:
http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/client/ui/DockLayoutPanel.html
http://www.giantflyingsaucer.com/blog/?p=2302

http://stackoverflow.com/questions/19150353/what-is-the-logic-of-dockpanel-docklayoutpanel-in-gwt-im-confused
http://stackoverflow.com/questions/11037102/gwt-docklayoutpanel-child-widget-sizing
http://stackoverflow.com/questions/12751690/gwt-docklayout-panel-in-uibinder


DockPanel:
https://www.tutorialspoint.com/gwt/gwt_dockpanel_widget.htm


CSS:
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;

public interface IconGridResources extends ClientBundle {
    @Source("resources/IconGrid.css") 
    IconGridResources.IconGridStyle iconGridStyle();
    
    interface IconGridStyle extends CssResource {
        String container();
        String item();
        String itemLabel();
    }
}

SafeHTML:
http://stackoverflow.com/questions/13027460/gwt-safe-html-framework-when-to-use-and-why
http://www.gwtproject.org/doc/latest/DevGuideSecuritySafeHtml.html
http://www.gwtproject.org/javadoc/latest/com/google/gwt/safehtml/shared/package-summary.html
http://www.gwtproject.org/javadoc/latest/com/google/gwt/safehtml/client/SafeHtmlTemplates.html