Sirvelia

Create and set Gutenberg blocks templates for your posts, pages and custom post types.
<ol>
<li>Go to Blocks Templates->Create Template in your admin panel.</li>
<li>Start creating your template, adding any blocks you’d like with the Gutenberg editor.</li>
<li>Assign your newly created template to any post type (post, page or custom).</li>
<li>The template will be set as the default content of new posts of that type.</li>
</ol>
CBT also includes some blocks 😉
<ul>
<li>Private Block: A block that helps you protect your content and control its visibility. You can protect anything inside this “block container” with a password, allow only logged-in members to see the contents, filter by user role and display only in single or archive pages.</li>
<li>Accordion: An accordion-like drop down with a header and InnerBlocks, so you can create multiple accordions inside.</li>
<li>CSV Tables: Allows you to import a CSV file and show its contents in a table with search and order functionality.</li>
<li>Card: A simple bordered box with a header and custom content (Inner Blocks).</li>
<li>Social share: Choose your favorite social media platforms and allow visitors to share your content easily. Supports: Buffer, Diaspora, Douban, Evernote, Facebook, Flipboard, Hacker News, Hatena, Kakao Story, LINE, LinkedIn, Menéame, Mixi, Pinterest, Pocket, Qzone, Reddit, Renren, Telegram, Tumblr, Twitter, VK, Weibo, WhatsApp and Xing</li>
</ul>
And new controls for any blocks with rich text!
<ul>
<li>Font Awesome Icons: Search Font Awesome 5 icons and include it in your posts as inline elements.</li>
<li>Dynamic Text: Display the author name, post title, published date, categories and/or tags anywhere on your posts.</li>
</ul>

Custom Blocks Templates

Create and set Gutenberg blocks templates for posts, pages and custom post types

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.

Custom Blocks Templates vs Advanced Classic Editor