Matt Wiebe

Locks down the TinyMCE visual editor with a sane set of buttons that will help your authors to not insert disruptive styles.
3rd-party buttons are maintained, so your other plugins should keep working if they add buttons.

Sane Visual Editor

Locks down the TinyMCE visual editor with a sane set of buttons that will help your authors to not insert disruptive styles.

Daniele De Santis

WordPress Manage TinyMCE Editor allows you to add buttons to WordPress TinyMCE editor. 
Using the plugin you will be able to add the following buttons to the default WordPress visual editor:
Cut 
Copy 
Paste 
Source code 
Font family selector 
Font size selector 
Style selector 
Background color 
Empty document 
Superscript 
Subscript
Select the desired buttons in the plugin’s settings page and they will be available in TinyMCE.

Manage TinyMCE Editor

Add buttons to TinyMCE, WordPress' default visual editor.

Sane Visual Editor vs Manage TinyMCE Editor