Thomas

Really simple plugin that allows you to easily add tooltips to your posts using the shortcode [wpetp].
It was made for some simple tooltips with text and/or images. For example if you want a way to add some information about a word in your post without forcing the user to leave the page to see them.
Feel free to ask for some features if you think I missed some.
Languages: English.

WP Easy Tooltips

Simple plugin that allows you to easily add tooltips to your posts using a shortcode.

Nurul Amin

Easily add Bootstrap popover to your site. You can create custom post and use as popover anywhere in your site with short code. 
Just use like this: [wpob-popover id=””] 
Post title will show as Popover text and post content will show as popover content.
<h4>Features</h4>
<ul>
<li>Use Custom post as popover.</li>
<li>Support any HTML in popover content. </li>
<li>Customize color for popover title text.</li>
<li>Customize color for popover body text. </li>
<li>Set custom with for popover.</li>
</ul>

WP Popover

Easily add Bootstrap popover to your site. You can create  custom post and use as popover anywhere in your site with short code.

WP Easy Tooltips vs WP Popover