digrart

This plugin allows you to add a meta description to each post, page, or custom post type as well as archives and taxonomies directly from the WordPress editor. Simplify SEO for your WordPress site without any extra fluff.

dig Description

Just the Meta Description. / 投稿ページやアーカイブページに、ただディスクリプションを設定できるだけのプラグインです。

Kunal Shivale

This plugin is for globally Meta Keyword and Meta Description. Once its configured it can be used in all pages.
It has below features: 
1. Add Meta Keyword 
2. Add Meta Description 
3. Add Meta Robots 
4. Add Meta Tags

Global Meta Keyword & Description

This plugin is for globally Meta Keyword and Meta Description. Once its configured it can be used in all pages.

dig Description vs Global Meta Keyword & Description