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>
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BBSpoiler

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

shauno

Welcome to the Betta Boxes CMS plugin. This plugin turns your WordPress Blog into a powerful CMS, without the need to get down and dirty in the source code. 
Betta Boxes gives you a clean, simple administration user interface to create custom fields, and link them to Posts, Pages, and any Custom Post Types you have!
Betta Boxes uses the default WordPress functionality of ‘post meta’. This means the plugin works with WordPress, rather than fighting against it.
You can create the following types of custom fields, and link them to any post types:
<h4>Field Types</h4>
<ul>
<li>Short Text</li>
<li>Long Text</li>
<li>HTML Text</li>
<li>Drop Down</li>
<li>Check Boxes</li>
<li>Radio Buttons</li>
<li>Color Picker</li>
<li>Date Picker</li>
<li>Time Picker</li>
</ul>

Betta Boxes CMS

Create custom fields linked to posts, pages, or any custom post type with a point-and-click user interface.

BBSpoiler vs Betta Boxes CMS