JoomClub K2 Tabs is one of the best K2 add-ons, which comes with pre-built 25 tab themes and styles. It can automatically pull your K2 contents, with a click on one button.
All you need to do is select the K2 categories, and the number of tabs. It will automatically pull the contents and show them on the tabs.
Highly configurable and backed with a 24×7 Customer Support package. This module is cross browser compatible and works on all the modern browsers.