Ilias P

codinghabits

This is a WordPress plugin that helps visualize the position of action hooks in the front-end. It is compatible with any theme or plugin as long as it doesn’t use dynamic names for its actions. 
This plugin detects once per day all “do_action” (except dynamic ones) functions from .php files in the wp-content/plugins & wp-content/themes folder & highlights their position in the front-end of the website when requested. 
Only administrators will be able to see the highlights.

Visual Action Hooks

Detect action hooks added with "do_action" function from any theme or plugin & display them for logged in administrators.

barteled

Instruct allows WordPress bloggers to add step-by-step instructions to their site. No longer will you have to fumble with tables and layout issues. Instructions can be quickly created and linked to corresponding images. Everything from recipes to technical tutorials; this plugin makes it easier.
Simplify:
<ul>
<li>Online product manuals</li>
<li>Driving directions</li>
<li>Recipes</li>
<li>Technical tutorials</li>
<li>Installation instructions</li>
</ul>
Build tutorials, share knowledge and keep traffic at your blog.
This plug-in was forged deep in the fires of <a href="http://think-bowl.com/" title="It's less of a tank and more of a bowl." rel="nofollow ugc">Think Bowl</a>

Instruct

Easily build step-by-step tutorials with images from the media gallery.

Visual Action Hooks vs Instruct