ZooTemplate is a professional Joomla templates and extension provider. They are specialized in the development of templates for Joomla 2.5 and Joomla 3 using the ZO2 Framework. In addition many of them use responsive design to adapt the website to mobile devices. Their templates are usually compatible with popular extensions such as K2 and Zoo
Also they have a large number of free extensions for Joomla that you can download from their website.