jeremywarne

If your site has a large number of categories, it can be helpful to be able to search through them rather than scrolling to find the one you need. This plugin adds a text box to the category list which filters the list in place, rather than providing an AJAX autocorrect, so it’s very fast.

Category filter

Filter a large number of categories when editing posts.

George Nagy

FilterFlex

A powerful plugin for applying filters to various WordPress elements with custom field support and dynamic tag replacement.

Category filter vs FilterFlex