WCS8: Commerce Composer Framework
What is what -

From feature pack 7 of WCS 7 onwards, a new feature
called commence composer is introduced which will help the business to change
the layout & alignment of widgets without much involvement from IT team.
Widgets are independent components which can be plugged anywhere and will
perform the pre-defined functionalities.
A Commerce Composer widget is a frame that displays a specific type of store content, such as ads, product recommendations, or navigational links. To create a layout, you add widgets to slots in a layout template, and then set the properties and content for each widget.
WebSphere Commerce provides the Commerce Composer widget library, which offers over two dozen out of the box widgets for creating store pages rich with features to enhance the shopping experience. You can customize the widgets to suit your store design. You can also use widgets from IBM business partners and other sources, if the widgets are developed to be compatible with the Commerce Composer tool.
Installing the Java Emitter Template (JET) package