Tammy Hart

Aaron Forgue

The Custom Class Selector plugin allows users to style their post content using 
custom classes made available by the active theme. Theme developers can make 
custom style classes available within the visual editor by adding a simple 
function to the functions.php file included with their theme.

Custom Class Selector

Allows users to style their post content using custom classes made available by the active theme.

Zeno Popovici

Graffino

miguelibero

This plugin adds 1 button to <a href="http://tinymce.moxiecode.com/" rel="nofollow ugc">TinyMCE</a> to clear floating elements. It also adds divs to valid tags so they won’t be deleted if empty.
Originally by <a href="https://wordpress.org/plugins/tinymce-clear-buttons/" rel="ugc">Miguel Ibero</a>.

Clear Floats Button

Adds clear float button to TinyMCE Editor.

Custom Class Selector vs Clear Floats Button