With sPro Article List Module you can have a menu of all your articles in a selected category or categories displayed with an accordion menu in any module position. The category name will be the header and if you click on it it will show all the articles as a sub-menu that slides open.
Links directly to your Joomla! articles (no extra setup needed)
You can customize the text,rollover and background colour to fit your site's template.
You can control how many articles to display under the header or show them all.
Activate or de-activate article count next to the category name.