evert_mouw

This plugin sets the <code><title></code> tag in the <code><head></code> section of the HTML output.
First page / index page:
<pre><code>title = name of the website | subtitle (short description of the website)
</code></pre>
All other posts and pages:
<pre><code>title = title of the post/page | name of the website
</code></pre>
Notes:
<ul>
<li>The seperator is the default symbol, probably “|”.</li>
<li>Feeds only receive the page/post title and are not modified.</li>
<li>Page numbers are handled too.</li>
</ul>
The code is a very basic copy of:
<a href="https://codex.wordpress.org/Plugin_API/Filter_Reference/wp_title" rel="nofollow ugc">https://codex.wordpress.org/Plugin_API/Filter_Reference/wp_title</a>

Title Tag, Evert's simple version

This plugin sets the tag in the section of the HTML output.

hitmax1978

Find the post. Click “Edit post”. Activate the “Text” tab of your post.
To modify the title tag of your post, add a simple string into your post content: 
<!—title=”your title”—> (See screenshot-1)
To modify the description tag of your post, add: 
<!—description=”your description”—> (See screenshot-1)
IMPORTANT!!! Be sure after “<!” characters you have two “-” characters. It is similar to HTML comment tag.
Multilingual support
If some kind of multilingual plugins are active (for example Multilanguage by BestWebSoft) – you can define titles and descriptions in other way: (See screenshot-2)
English locale (United States) 
<!—title_en_US=”your title”—> 
<!—description_en_US=”your description”—>
Українська локаль 
<!—title_uk=”Ваш заголовок”—> 
<!—description_uk=”Ваш опис”—>
Русская локаль 
<!—title_ru_RU=»Ваш заголовок»—> 
<!—description_ru_RU=»Ваше описание»—>
Feedbacks are welcome. Visit <a href="http://onlineservicetools.com/meta-tags-from-content-wp-plugin-discussion-feedbacks" rel="nofollow ugc">onlineservicetools.com</a>

MetaTagsFromContent

Good in multilingual site

Generates title and description tags from post's content.

Title Tag, Evert's simple version vs MetaTagsFromContent