Nazmur Rahman

Text Selection Color plugin helps to change the color of the selected text in the website easily.
Features:
<ul>
<li>User can change text color and text background color from plugin settings page with color picker.</li>
<li>Changes can be seen as preview in the plugin settings page.</li>
</ul>
<h4>Translators</h4>
<ul>
<li>Bengali (bn) – <a href="http://nazmurrahman.com/" rel="nofollow ugc">Nazmur Rahman</a></li>
<li>Spanish (es) – <a href="http://firstsiteguide.com/" rel="nofollow ugc">Ognjen Djuraskovic</a></li>
<li>Serbian (sr) – <a href="http://firstsiteguide.com/" rel="nofollow ugc">Ognjen Djuraskovic</a></li>
</ul>

Text Selection Color

Text Selection Color plugin helps to change the color of the selected text in the website easily.

Sibin Grasic

Select to Share WordPress plugin will allow you to easily display a nice pop-up menu on text selection. 
CSS selector option is provided so you can target only your post / page content.
Features
<ul>
<li>Automatically displays a nice pop-up menu on text selection (highlight)</li>
<li>Mobile fallback with pop-under sharing menu</li>
<li>Highly compatible – you can change the css selector for the text highlight</li>
</ul>

Select to Share

Nice

Show a nice pop-up menu on text selection for sharing on Facebook, Twitter and e-mail...

Text Selection Color vs Select to Share