Michael

In this plugin you can set an individual title and description for each page and post and they will placed in the header of the page.
Additionally the uft-8 charset is set.

mst_meta

Plugin, which sets meta-title and meta-description like you give it for post or page.

Ariana

This is a very simple plugin that adds a “robots” meta tag to the head of your site with “noarchive” in it.
The effect of the noarchive robots meta tag is that search engines will not keep a cached version of your pages and posts.

mst_meta vs Simple Noarchive