Categories Accordion is a flexible module that shows all categories of Joomla content as a multilevel accordion menu. The accordion effect is written in native mootools javascript which is supported by Joomla! core so that there will be no javascript conflict when you use this module. When you hover or click on parent categories, the module enables you to view all child categories and the number of articles. With 4 clean themes and various options, Categories Accordion is easy to config and well-designed.