Jive includes widgets users can customize pages with. As an administrator, you can control which widgets are available to users.
Admin Console: System > Settings > Widgets
You can delete widgets by clicking the Remove button. For a list of the widgets included with the application, along with descriptions, see Designing Pages with Widgets.
You can also add new widgets. At the bottom of the page, under Add a new widget, enter the fully-qualified class name of the class for the widget you're adding, then click Add Widget. The JAR containing the widget you're adding must be on the application's classpath.