A robust template framework makes it easy for you to design and customize your own website
Template Framework for SmartAddons Templates.
Chameleon changes the way your site looks and acts under different conditions. It's like a multi-site extension, except your site can respond to much more than just domains…
Advanced Template Manager is an extension that changes the way your Template manager works.
Template Creator is a tool for creating joomla templates that allows you to make your own template package.