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.

Wow-Company

DmtLo

Contact Form 7 plugin allows editing forms with a standard textarea. This addon adds an HTML editor with code highlighter to each contact form and provides many useful options to enhance your forms.
<h4>Editor Features</h4>
<ul>
<li>HTML Editor with syntax highlighting powered by CodeMirror</li>
<li>Dark Theme (Material) support for comfortable editing</li>
<li>Auto-close brackets and tags</li>
<li>Code folding and line numbers</li>
<li>Search and replace functionality (Ctrl+F)</li>
</ul>
<h4>Form Behavior Options</h4>
<ul>
<li>Test Mode – Hide form from non-administrators for testing purposes</li>
<li>Remove Auto Tags – Remove auto-added p and br tags from form output</li>
<li>Redirect After Submit – Redirect users to a custom URL after successful submission
<ul>
<li>Support for ACF fields to get dynamic redirect URL from current page</li>
<li>Option to open redirect URL in new tab</li>
<li>Option to force file download</li>
</ul>
</li>
<li>Hide Form After Submit – Hide the form and show only success message</li>
<li>Disable Submit Button – Prevent double submissions by disabling button during form submission</li>
<li>Pre-fill Fields from URL – Auto-fill form fields from URL parameters (e.g., ?your-email=test@example.com)</li>
<li>GA/GTM Event – Send custom event to Google Analytics/GTM dataLayer on successful submission</li>
<li>Scroll to Message – Automatically scroll to success/error message after form submission</li>
<li>Auto-hide Success Message – Automatically hide success message after specified seconds</li>
<li>Remove Refill – Clear form fields after validation error</li>
</ul>
<h4>Performance</h4>
<ul>
<li>Conditional Script Loading – Load CF7 scripts and styles only on pages with contact form shortcode</li>
</ul>
To improve the plugin’s functions and add new functions, write to us on the support <a href="https://wordpress.org/support/plugin/cf7-coder/" rel="ugc">forum</a>.
<h4>Support</h4>
Search for answers and ask your questions at <a href="https://wordpress.org/support/plugin/cf7-coder/" rel="ugc">forum</a> or send requests on the <a href="https://github.com/wow-company/cf7-coder/issues" rel="nofollow ugc">github</a>.

HTML Editor for Contact Form 7

Add HTML editor to Contact Form 7 with code highlighter and extended form options.

Quicktags for WP vs HTML Editor for Contact Form 7