Fancy Tabs is the best Tabs module for Joomla, which supports Joomla contents, K2 contents and Joomla modules as well. That means you can set Joomla articles as Tabs, K2 contents as Tabs, Joomla Modules as Tabs.
It comes with pre built 26 styles to choose from. Just select the style and its ready to go. Matches with all website themes and has got a lot of features.
Works very well on all types of Joomla templates. Highly configurable and backed with a 24×7 Customer Support package. This module is cross browser compatible and works on all the modern browsers. Bug Free and works great!.