A WordPress plugin that contains many blocks to build your RundizStrap theme, or you can use it with any Bootstrap 5 themes.
You can manually set CSS class(es) by referring to the Bootstrap document.
Supported custom HTML attributes like <code>data-*</code>, <code>aria-*</code> in most blocks.
Available blocks:
<ul>
<li>Customizable div</li>
<li>Layout container</li>
<li>Layout row</li>
<li>Layout column</li>
<li>Search (for navbar and anywhere else)</li>
<li>Pagination (for list posts)</li>
<li>Navbar container</li>
<li>Navbar toggler button (for responsive toggler)</li>
<li>Navbar responsive wrapper (collapse, offcanvas)</li>
<li>Navbar navigation (display menu items)</li>
<li>Button (link, or button)</li>
<li>Comment form</li>
<li>Post navigation (display next, previous post)</li>
</ul>
Tested up to PHP 8.5.
The original source code is on GitHub ( https://github.com/Rundiz-WP/rundizstrap-companion ). 
It contains the original source of blocks before compile/build and blocks that are already built, the build tools via Node package (package.json).

RundizStrap Companion

A plugin that contains blocks for the Bootstrap theme that help you customize your site in your style. All blocks are based on Bootstrap CSS.

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.

RundizStrap Companion vs Advanced Classic Editor