MrXHellboy

This plugin offers your visitors the possibility search on post tags. 
All you have to do is install this plugin and create a page and add the following shortcode: [tagsarchive]
The following CSS classes and divisions are added to this plugin so you are able to customize the look in your own stylesheet. 
This because when i update the plugin, no work will be lost on your side.
form#form-search-tags, span.error, form#form-search-tags legend, form#form-search-tags fieldset, span.headings, form#form-search-tags h3
<h3>Development Blog</h3>
<a href="http://online-source.net/category/scripts/wordpress-plugins/" title="Online-Source WordPress plugins" rel="nofollow ugc">Online-Source WordPress plugins</a>
<h3>Development</h3>
Version 1.1: Fixed: error message added if both fields (tagname like and tagname is) are empty. 
Version 1.2: Fixed: shows no tags anymore which have a usage of 0.

Advanced tag search

This plugin offers your visitors the possibility search on post tags.

Blackbam

Clients tend to get crazy if they have to edit HTML code on their own or if little things are not working as expected. Make your editing experience as simple and good as possible:
Customize TinyMCE / TinyMCE Advanced (or other TinyMCE variants) to fit your needs.
Basically, this Plugin does two things for you:
A. This Plugin installs two files editor-style.css and editor-style-shared.css into your Theme folder (so you can still do updates of the Plugin), which can be edited in the backend of your site
<ul>
<li>editor-style.css is used for styling your TinyMCE Editor</li>
<li>editor-style-shared.css is used for styles to be used in your theme AND in your TinyMCE editor (so you do not have to copy)</li>
</ul>
Note: To use this feature, you have to write your own CSS code into this files, which is the only professional way to do it.
B. The main feature of this Plugin is to offer a GUI to create custom style formats for TinyMCE dynamically
<ul>
<li>Easy and very fast to add/change/delete</li>
<li>You do not have to change one single line of source code</li>
</ul>
Current Languages:
<ul>
<li>en_US</li>
<li>de_DE</li>
<li>es_ES (Andrew Kurtis, webhostinghub.com)</li>
<li>sr_RS (Ognjen Djuraskovic, firstsiteguide.com)</li>
</ul>
Please report any bugs you may encounter and support this Plugin if you like it.
Plugin URL: <a href="http://www.blackbam.at/blackbams-blog/2013/06/03/wordpress-plugin-tinymce-and-tinymce-advanced-professsional-formats-and-styles/" rel="nofollow ugc">http://www.blackbam.at/blackbams-blog/2013/06/03/wordpress-plugin-tinymce-and-tinymce-advanced-professsional-formats-and-styles/</a>

TinyMCE and TinyMCE Advanced Professsional Formats and Styles

Improve, style and customize TinyMCE / TinyMCE Advanced using custom editor stylesheets and a dynamically configurable styles dropdown.

Advanced tag search vs TinyMCE and TinyMCE Advanced Professsional Formats and Styles