Steve

This plugin uses custom fields to allow the page title tag to be customised and differ from the actual page title.
Both meta descriptions and keywords can also be added if required.
Page meta details can be modified on any publicly accessible post type, such as posts and pages, as well as custom post types.
Theme and plugin developers should note that it is possible override the page title within your templates by setting <code>$wppm_title = 'Newly defined title';</code> before the call to <code>get_header();</code>.

Page Meta

Adds the ability to override the page meta title and add in meta descriptions and keywords for pages.

prospermtabo

Swahili Seo is a plugin developed to assist website owners to easily set seo metadata for their published pages or posts.
Swahili Seo will be fully supported and maintained until as long as is necessary.
At a glance, this plugin adds the following:
<ul>
<li>Administrators can now set description metadata for post,page or a custom post.</li>
<li>Administrators can now set keywords metadata for post,page or a custom post.</li>
</ul>

Swahili Seo

Set description and keywords metadata for your website.

Page Meta vs Swahili Seo