Automattic

Yoav Farhi

This plugin adds a button to the admin bar that allow admins to switch the text direction of the site. It can be used to test WordPress themes and plugins with Right To Left (RTL) text direction.

RTL Tester

Great simple plugin that helps tremendously! Pairs great with RTL Tester Mirror plugin too :)



Great help!

Does what it says and makes it easy to test rtl support.

Great for plugin development

when a plugin does what you expect it should do and you spend a lot less time thanks to it, for me that plugin is great, and this is the case. A perfect plugin for developers

perfect

Really easy to use and helpful while testing and improving RTL support!

Excellent plugin!

Test your themes and plugins in RTL mode.

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.

RTL Tester vs WP-RTL