Epigrade

Add page title, meta description, keywords and robots to all post types and taxonomies. 
Plugin will automatically change page titles for posts, pages, custom posts, categories, tags and custom taxonomies to 
whatever you have entered. Also will inject meta fields in template head section. If however you leave fields empty 
default WordPress or theme behaviour will occur. 
This plugin also removes taxonomy description column from listing table.
You can use it in your theme or other plugin. It creates the following taxonomy and post meta fields: 
 _page_title, <code>_meta_description</code>, <code>_meta_keywords</code>, <code>_meta_robots</code>.
Example usage:
<pre><code>// Get page title value for taxonomy with ID $term_id:
$taxonomy_title = get_term_meta( $term_id, '_page_title', true );

// Get page title value for post with ID $post->ID:
$post_title = get_post_meta( $post->ID, '_page_title', true );
</code></pre>

WP Simple SEO Meta

Add page title, meta description, keywords and robots to all post types and taxonomies.

krishna711

Plugin now support custom taxonomy. Tested with Woocommerce, FoxyShop and WP-ECommerce
Localization support added.
Fixed meta title bug in 2.1. Thanks to phil who reported this bug. 
Added meta tags support for tag pages.
Allow you to add custom meta tags for category and tag pages. This plugin specially designed to work with All In One SEO plugin. If you are using other seo plugin such as HeadSpace2 or SEO Title Tags plugin then this plugin is not for you because this plugin already supporting meta tags for category pages.
Note before upgraded: 
Title tags implemented in a completely new way. If you are previous user and want to upgrade then you need to edit all-in-one-seo-pack again. Old editing will not work with this version. see installation tab for more details.
Version 1.1 optimized for wordpress 3.0 and above. Do not upgrade if you are using wordpress version earlier then 3.0. 
Peoples are using wordpress lower then 3.0 should use 1.0 version.
<h4>Translators</h4>
<ul>
<li>Russian (ru_RU) – Sergey Yakovlev</li>
</ul>
<h3>Follow Me</h3>
Follow me on Twitter to keep up with the latest updates <a href="http://twitter.com/balakrishna/" rel="nofollow ugc">Bala Krishna</a>

Category SEO Meta Tags

Plugin now support custom taxonomy. Tested with Woocommerce, FoxyShop and WP-ECommerce

WP Simple SEO Meta vs Category SEO Meta Tags