manornk

META SEO is a plugin that helps you get more visitors through SERPs (Search Engine Results Page). It adds meta description for every post and page, based on their content, but also enables you to add custom meta description on every post, as well as HomePage meta description via META SEO menu. 
Also you can add rel canonical tags on pages and posts.
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META SEO

META SEO is a plugin that helps you get more visitors through SERPs (Search Engine Results Page).

jphase

WP Modification History enables a metabox that shows modficiation history by date/time, user, and the values that were modified. The modified values are shown in a diff format so that you can easily see what lines and characters were modified, deleted, added, etc.
Within the settings page, you are able to toggle off/on meta values in the event you don’t want certain things to be tracked when hitting the update button on that post type.
Possible future features:
<ul>
<li>Additional settings and display options (AJAX pagination, limit of results per page/metabox, etc.)</li>
<li>Comments and remarks on a particular revision</li>
<li>Email notifications when specific changesets are made</li>
<li>Stats</li>
</ul>

WP Modification History

WordPress Modification History adds a metabox that shows modification history on a particular set of post types.

META SEO vs WP Modification History