Piyush Dhanotiya

Control the block editor and classic editor per post type with a simple settings page.
With this plugin you can:
<ul>
<li>Disable the block editor for selected post types.</li>
<li>Disable the classic editor for selected post types.</li>
<li>Lock the chosen editor mode when using the Classic Editor plugin.</li>
<li>Prevent conflicting settings for the same post type.</li>
<li>Reset all settings from the admin page.</li>
</ul>
This plugin is useful for agencies, developers, and site owners who need a cleaner editing experience across custom post types.
<h3>Features</h3>
<ul>
<li>Simple settings page under Settings > Editor Control.</li>
<li>Works with public and custom post types that are visible in the admin.</li>
<li>Compatible with the Classic Editor plugin when installed.</li>
<li>Prevents the same post type from being forced into both modes.</li>
<li>Safe defaults with input sanitization and output escaping.</li>
</ul>

Mapoza Editor Control

Control the block editor and classic editor per post type with a simple settings page.

David Klhufek

This simple plugin adds useful buttons to the native WordPress HTML editor (Classic Editor).
Currently adds: 
h1, h2, h3, h4, h5, span, hr, nbsp, mox
The “mox” button adds a nice responsive CSS class which you can use to highlight pictures or other elements in your posts.
Note: This plugin works only with the Classic Editor. It does not support the new Gutenberg (Block Editor).
<h3>Compatibility</h3>
<ul>
<li>Requires the Classic Editor to be active. </li>
<li>Designed specifically for the HTML mode of the editor.</li>
</ul>

Quicktags for WP

This simple plugin adds useful buttons to the native WordPress HTML editor.

Mapoza Editor Control vs Quicktags for WP