Remove Parents is a tiny plugin which remove “category” and parent categories from permalink.
Auto TrackBack by Category
Use pages as category archive header, or list some posts from a category into a post/page.
Simply disables the usage of categories in your WordPress blog.
The Category Order plugin allows you to easily reorder your categories the way you want via drag and drop.
Allows date based archives to be listed by category.
WordPress Category Posts is a plugin for WordPress that creates a linked list of the posts in a specific category.