Henrik Björklund

The main purpose of the plugin is to start a discussion on how we could improve the editor in WordPress. This plugin is thus a very opinionated one. The button selection is done with reusable content in mind. All buttons that would results in harmful markup are removed.
The plugin also removes the kitchen sink button. Instead, there is an icon with three dots. Pressing that expands the row to contain all the available buttons. This works better with a responsive page than hard coded lines of buttons which in some widths break into four separate lines.
A detailed description of design decisions can be found <a href="http://akibjorklund.com/2015/editor-buttons-simplified" rel="nofollow ugc">on my blog</a>.

Editor Buttons Simplified

Editor Buttons Simplified is a simple WordPress plugin that makes adjustments to the TinyMCE editor buttons to make it more usable.

Fahad Alduraibi

Do you write posts in different languages that have different directions? 
This plugin enables a feature in the post editor which allow writing texts in Left-to-Right and Right-to-Left directions in the same post (or page) so you can write in English (and any other LTR language) and also RTL languages like Arabic, Persian and Hebrew.
Simply look for the new buttons added to the post editor after installing the plugin. (See the screenshots for better understanding)
اضافة زرارين لشريط التحرير لتمكين تحويل النص للقراءة من اليمين لليسار مثل اللغة العربية والفارسية والعبرية
<a href="http://www.fadvisor.net/blog/2008/10/wp-rtl/" rel="nofollow ugc">More details</a>
<ul>
<li>Note: This plugin will not change the direction of the post title, since that is controlled by the theme.</li>
</ul>

WP-RTL

Adds two buttons to the TinyMCE editor to enable writing text in Left to Right (LTR) and Right to Left (RTL) directions.

Editor Buttons Simplified vs WP-RTL