The common-GWT face is a separate module that is shared between various GWT based Geomajas faces (both the GWT face which uses SmartGWT and the pureGWT face).
The Geomajas rasterizing plugin allows vector layers to be rasterized on the server. It depends on the caching plugin to ensure tiles are not re-rendered each time. Styling for the features is described in SLD, making it very powerful.
The Geomajas utility widgets plug-in includes a set of additional widgets which can be used in your Geomajas applications. These include a wizard and a ribbon (which can replace the toolbar).