Clement Decou

Search dynamically a category in the box/block category in admin

WP search category admin

Add a search input into a Post edit Page to add fast category for a Post and in quick edit.

Flector

You can use this plugin to hide part of the text of a post in a nicely-formatted container that will becomes unhidden when clicked on. The plugin can be useful for creating FAQ pages, hiding large pictures, and things like that.
The plugin creates its own “Spoiler” button in the visual editor, but you can also add spoilers directly using tags. For example:
<pre><code>[spoiler title='Title']Spoiler content[/spoiler]
</code></pre>
or
<pre><code>[spoiler title='Title' collapse_link='no']Spoiler content[/spoiler]
</code></pre>
If you liked my plugin, please rate it.

BBSpoiler

This plugin allows you to hide text under the tags [spoiler]your text[/spoiler].

WP search category admin vs BBSpoiler