With an entire "army" of languages, programming ones of course, I can develop themes, addons, modules and extensions for different kinds of CMS systems, standalone websites or custom frameworks.
I can also create custom websites using:
PHP, HTML(5), javascript (jQuery), CSS(3), Mysql.
I do work with: Wordpress, Magento, CS-Cart, Joomla, and my own CMS system (ARM).
My favorite php framework is smarty!