crimson090

Adds buttons to the Text (HTML) edit which generate Markdown syntax. These buttons serve as a great introduction to 
users who are new to Markdown, as well as shortcuts for more experienced users. The buttons include:
<ul>
<li>Bold</li>
<li>Italic</li>
<li>Blockquote</li>
<li>Link</li>
<li>Code</li>
<li>Table</li>
<li>Headers</li>
<li>Help (links to external Github Markdown guide)</li>
</ul>
This plugin does not modify the Visual editor, as that editor is not ideal for writing Markdown in. It’s recommended you disable 
the Visual editor entirely to enforce using Markdown.
Note that this plugin does not render Markdown. You should use a plugin (such as Jetpack Markdown) to render markdown in your theme.

MarkdownBar

Adds a toolbar of buttons to the Text (HTML) edit which generate Markdown syntax

Farhad Sakhaei

DediData

ParsMizban

WordPress + TinyMCE + Font Awesome + Bootstrap 
This plugin extends the buttons on the Visual Editor toolbar.
It includes 20 plugins for WordPress Editor (TinyMCE)
<ul>
<li>Insert Many Icons from Font Awesome Set easily, Change their Size or Border!</li>
<li>Support HTML Templates (We will add many pre-designed templates soon!)</li>
<li>Insert Table of Contents based on headings</li>
<li>Insert sample of codes, and colorize them</li>
<li>Insert emoticons</li>
<li>Change Text Colors and Back Colors</li>
<li>Great Context Menu</li>
<li>Print, Paste as Text, Find and Replace, Insert Media, Special Characters, Horizontal Line, Read More Tag, Page Break Tag, Anchor, DateTime</li>
<li>Support for creating and editing tables.</li>
<li>Search and Replace in the editor.</li>
<li>Show Blocks, Show Invisible Characters</li>
<li>Insert predefined styles and Clear Formatting</li>
<li>More options when inserting lists.</li>
<li>Ability to set Font Family and Font Sizes.</li>
<li>Full Screen and Preview Options</li>
<li>And many others.</li>
</ul>
Validated by: 
https://wpreadme.com 
https://wordpress.org/plugins/developers/readme-validator

Advanced Classic Editor

This plugin has the clean codes and has the best practice of doing the process.

Clearn Source


This plugin has only 1 competitor: "Advanced editor tools" by Automattic. I mention it because I tested both. Atomattic's only adds the table and top menu capabilities, while Advanced Classic Editor also add icons, buttons, alerts, and other bootstrap related stuff to make your life easier.



Also I just reported an error with font-awesome, which analyzed by plugin author, fixed and released within hours by plugin author = KUDOS to him!



Thanks to this plugin, I could get rid of three others which only added bootstrap shortcodes and tables. I cannot thank this author enough. This is real good and brings TinyMCE back to life again.



It surely can be expanded with more bootstrap stuff like other premium plugins, but that's the cost of free stuff and I'm willing to keep it that way.


Best TinyMCE addon

Advanced Classic Editor - Your powerful WordPress editor, Insert many Icons, Insert Table of contents, etc.

MarkdownBar vs Advanced Classic Editor