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.

yehudaT

Block editor toolbar addition for mixed Rtl Ltr writing directions. It wrap words (or sentences) in paragraph block with span element and change their direction from rtl->ltr or ltr->rtl as you need.
Uses dir=”rtl” or dir=”ltr”. See also <a href="https://www.w3.org/International/articles/inline-bidi-markup/" rel="nofollow ugc">Inline bidi markup at www.w3.org</a>
Note that the wrapping element is so you can control it through your site CSS as well. i.e. .atr-inline-direction-rtl{direction: rtl;display:inline-block}

Atr Inline Rtl Ltr

Block editor toolbar addition for mixed Rtl Ltr writing directions. Wrap string with span element and change direction from rtl to ltr and vice versa

WP-RTL vs Atr Inline Rtl Ltr