Arab Spell Checker Team

Enables Arabic Spell Checking in the TinyMCE editor. 
The plugin relies on our spell checking API server to check words and generate suggestions. For that a single API request is done, and the response will contain all the presumably misspelled words and their correction suggestions. The plugin also uses an API endpoint to check the validity of the API keys used for spell checking. No other info is sent or exchanged with the API.
This plugin relies on Classic Editor plugin (https://wordpress.org/plugins/classic-editor/) and must be installed before enabling this plugin.
Service website (In Arabic only): https://arabicspellchecker.com/ 
Service’s Terms of use link (In Arabic only) : https://arabicspellchecker.com/terms.html

WP-SARAHSPELL

Enables Arabic Spell Checking in the TinyMCE editor.

.fay

This plugin auto detects and apply the right direction (RTL or LTR) on post’s titles, bodies and comments.
According to WordPress, adding support for language written in a Right To Left (RTL) direction is just a matter of overwriting all the horizontal positioning attributes of your CSS stylesheet in a separate stylesheet file named rtl.css. 
But this solution is working only when you have just an RTL blog (or just an LTR blog using the classical style.css). 
One of solutions: We will let WordPress applying the same style.css to both of RTL/LTR posts and this plugin will automatically detect the post language to correct its direction.
It’s just a beta version that I tested with the WordPress default theme, please let me know your feedback with your own complexed css.

WP Direction Detector

This plugin auto dectects and apply the right direction (RTL or LTR) on post's titles, bodies and comments.

WP-SARAHSPELL vs WP Direction Detector