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.

cxThemes

stuartobrien

Up until now the way theme and plugin developers find where to hook into with their add_action() and add_filter() functions is either to search through the WordPress code base, or find find a reference to the hook in the codex.
What Simply Show Hooks does is give you a simpler way to see these hooks by displaying them in-line on the page that you are on. All that’s left to do then is copy the hook you need, and paste it in to your add_action and add_filter functions like this: 
add_action( ‘wp_enqueue_scripts’, ‘my_enqueue_scripts_action’ ); 
add_filter( ‘the_title’, ‘my_the_title_filter’ );
I made this plugin so I could find WordPress hooks quicker and I use it all the time, so I thought I’d share it and see if it could help others.
Enjoy!
Please note that in odd cases, due to the nature of actions and filters, the plugin may display a hook in place that disrupts the display of your site – in which case we always display the ‘Hide Hooks’ button so you can switch it back off. This won’t disrupt the look of you site to anyone but you so don’t worry.

Simply Show Hooks

Good

Simply Show Hooks helps theme and plugin developers to quickly see where all the action and filter hooks are on any WordPress page.

Category filter vs Simply Show Hooks