Extensions
Graffito has styled, including responsive, support for the popular third party content / CCK extension by JoomlaWorks.gr, K2.
SplitMenu
SplitMenu is a basic, static menu system that places parent items in the header navigation area, and all children in the sidebar, or as configured.
FusionMenu
Fusion with MegaMenu is a Mootools enhanced, CSS dropdown menu system, with features such as multiple columns and inline icons.
Mosaic
Mosaic, a template layout for RokSprocket, presents content in a dynamic and interactive grid structure; perfect for magazine and content sites.