Normally, a category that consists of subcategories is displayed in such a way that only the list of subcategories is visible, with information how many pages are in that subcategory.
This simple plugin displays lists of pages that reside under each subcategory.
It doesn't have any configuration options (I could add maxitems or include subcats but I didn't need it), it just displays the list of pages in a ROWCAT loop. I made it because I needed it in one of my projects. You can extend it as you wish. You can use any page tags in the template, together with extra fields. The template is pageavatar ready.
Hope you like it.
Download rowcatchildren plugin