AndrewUlrich

This plugin creates two widgets:
<ol>
<li>A widget where you can choose from all the categories in your blog.</li>
</ol>
This is similar to what newegg.com uses, where you can select multiple categories, and it will only show posts belonging to all the categories you select, and such categories can be narrowed down by selecting their subcategories.
<ol>
<li>A widget where you can choose from all the tags in your blog</li>
</ol>
You can select the tags you want to search for, and it will only show posts that have all of the tags you selected.
<h3>Known Issues</h3>
After upgrading from 2.1 to 2.2 it is highly recommended that you deactivate the plugin and then re-activate it. Unfortunately WordPress 3.1 no longer calls register_activation_hook when the plugins are upgraded, so this may be necessary, otherwise you may not see all your categories.
When using version 3.2 or above, and excluding categories, the display order may or may not be mixed up when you exclude a parent category.

Faceted Search

This plugin will create widgets that you can use to conduct faceted searches using the categories or tags on your site.

Arjan Olsder

Want to automatically create cornerstone content? WPA SEO Auto Linker helps get this done. Simply create a new keyword or a new phrase. The system will link that keyword or phrase to your chosen dofollow URL. Through the settings, it is easy to finetune the workings of this plugin. For performance, it is best to make use of a caching engine.
“Using this plugin didn’t just help define cornerstone content in our SEO strategy, it also increased pageviews by 18%. The average visitor spends 13 seconds more on our website.” – Roelof van Doorn, technical editor at GadgetGear.nl
While our plugin has been without support for three years, we have seen a lot of similar plugins moving in. Please note we will not be adding fancy interfaces or click tracking. The reason is we want to remain the fastest tool on the market. Click tracking takes a heavy hit on your database while creating a smooth graphical interface will lead to code bloat and the security risks that come with maintaining huge heaps of code. We just don’t want that.
<h3>Credits</h3>
WPA SEO Auto Linker plugin is based on the SEO Auto Links 0.5 plugin by Maarten Brakkee. 
https://wordpress.org/plugins/seo-auto-links/
The SEO Auto links plugin is based on the SEO Smart Links 2.7.6 plugin by Vladimir Prelovac: 
https://wordpress.org/plugins/seo-automatic-links/
Inspiration for SEO Smart Links originated from the Autolink plugin by Chris Lynch 
http://www.planetofthepenguins.com/
<h3>License</h3>
This file is part of WPA SEO Auto Linker.
WPA SEO Auto Linker is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
WPA SEO Auto Linker is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with WPA SEO Auto Linker. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

SEO Auto Linker

I will happy with this plugin and well replied on time. Now plugin compatible with UTF8 characters.

Work with UTF8 (GREEK) Language

SEO Auto Linker assists in creating cornerstone SEO content. This is not a full replacement for SEO plugins.

Faceted Search vs SEO Auto Linker