Splitmenu differentiates its children into 3 modes: Parents are displayed in the header area, its direct children are displayed in a bar underneath, and all subsequent children are published to the sidebar.
K2: Integrated Third Party Component - (Not Included in the RocketLauncher)
K2 is a content construction component which allows you to create custom content types in your Joomla Site. The component drastically expands the power and functionality of Joomla content. Download from http://www.getk2.org.