Timo Schlueter

TagMeta generates meta keywords using your most used tags. 
It automatically gets the 10 most used tags out of your 
blog posts and pages and puts them into a valid meta- 
keyword string. This string then appears in the header of 
the home page of your theme. If you want to add tags per 
post, i suggest youre going to use the Headspace plugin.

TagMeta

TagMeta generates meta keywords using your most used tags.

mukeshjakhar888

The first complete free all in one SEO solution for WordPress websites, including home page, archive pages, single post page etc. you can also set custom keywords, social media links for your hole website. This plugin helps you in SEO by adding Meta keywords, Description, facebook twitter google plus meta tags to each and every page, post, archive. (category, tag, date, day and year). This plugin also allows you to specify common keywords to be included on every web page. Plugin from one of the best coder <a href="http://www.phpkida.com/mukesh-jakhar-wordpress-php-web-developer-and-designer/" rel="nofollow ugc">Mukesh Jakhar</a>. For any support just leave your question at our <a href="http://www.phpkida.com/swt-seo-helper/" rel="nofollow ugc">SWT SEO HELPER PLUGIN</a> page. 
Uses Title, Description, Categories, tags, Compulsory keywords (provided by you in setting) for keywords generation.

SWT SEO Helper

This is awesome free seo plugin, guys should be use once, very simple optimize on single setting page this is working great...

This is awesome free seo plugin, guys should be use once

SWT SEO Helper auto generating keywords, Adds Meta keywords and Description, facebook twitter google plus meta tags to each and every page, post, arch …

TagMeta vs SWT SEO Helper