jim912

Outputs meta description and meta keywords in the element head. 
Notice! Current version japanese only, yet.
<h3>Links</h3>
“<a href="https://wordpress.org/extend/plugins/ps-auto-sitemap/" title="WordPress sitemap plugin">PS Auto Sitemap</a>” is a plugin automatically generates a site map page from your WordPress site. 
It is easy to install for beginners and easy to customize for experts. 
It can change the settings of the display of the lists from administration page, several neat CSS skins for the site map tree are prepared.
“<a href="https://wordpress.org/extend/plugins/ps-disable-auto-formatting/" title="WordPress formatting plugin">PS Disable Auto Formatting</a>” 
Stops the automatic forming and the HTML tag removal in the html mode of WordPress, and generates a natural paragraph and changing line.
“<a href="http://www.web-strategy.jp/" title="CMS service with WordPress" rel="nofollow ugc">CMS service with WordPress</a>” provides you service that uses WordPress as a CMS.

Meta Manager

Outputs meta description and meta keywords in the element head.

Anton Kuliashou

Simple SEO by falbar adds basic meta data on the page (title, description, keywords). For WooCommerce you will need to install <a href="https://wordpress.org/plugins/simple-seo-woo-by-falbar/" rel="ugc">Simple SEO Woo by falbar</a>.

Simple SEO by falbar

This plugin extends the standard SEO WordPress features.

Meta Manager vs Simple SEO by falbar