pluginsforall

An easy way to add meta keywords to your posts and pages. Just put the keywords in the text field of each post or page and they will appear when the post or page is displayed.
<h3>Keyword Research</h3>
<a href="https://localruler.com" rel="nofollow ugc">Get keywords at localruler.com</a>

Local Ruler Meta Keywords Manager

An easy way to add meta keywords to your posts and pages.

Stefan

Ever noticed that on tag-pages multiple tags are possible? E.g. if you want to show all 
posts having “tag1” AND “tag2”, just go to 
http://yourwordpressblog/tag/tag1+tag2
But only “tag1” is correctly displayed (see screenshots). 
With this plugin you can use more than one tag correctly. This is especially interesting if 
you want to optimize some key phrases (like “tag1 tag2”) for searchengines.
Moreover this plugin can add the description of the tags to your tag-pages, simply put
<pre><code><?php echo multi_tags_get_description('', ''); ?>
</code></pre>
into your theme-file “tag.php”. 
To display the correct tags, just replace the call to
<pre><code>single_tag_title( '', false ) 
</code></pre>
with
<pre><code>if (function_exists('multi_tags_get_title'))
 echo multi_tags_get_title('and', 'or')
else
 single_tag_title( '', false )
</code></pre>
The inclusion of your tags into “meta keywords” resp. the inclusion of the tag-descriptions 
in “meta description” is done by the plugin. 
Simply check the corresponding checkboxes in the MultiTags-setting-page.
For more examples and background information have a look at:
http://www.vogel-nest.de/wp_multitags_plugin
<h3>Thanks</h3>
To Frank Bueltge http://bueltge.de for motivation and checking the first draft.

MultiTags

Display correct tags when calling a tag-page with more than one tag.

Local Ruler Meta Keywords Manager vs MultiTags