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.

xenice

Xenice SEO is a simple, fast, and lightweight SEO plugin designed to give you precise control over meta descriptions and keywords for every post, page, and taxonomy.
Unlike heavy SEO frameworks, Xenice SEO focuses on the essentials — helping search engines better understand your content without slowing down your website.

Xenice SEO

A lightweight SEO plugin that allows you to add meta description and keywords fields for posts, pages, categories, and custom post types.

Page Meta vs Xenice SEO