Adds useful decoration features to the Gutenberg RichText editor toolbar.

Shea Bunge

Visual Term Description Editor

Replaces the plain-text category and tag description editor with a visual editor.

feedmeastraycat

WP Editor Widget

WP Editor Widget adds a rich text widget where the content is edited using the standard WordPress visual editor.

WordPress.org

iseulde

Advanced Rich Text Tools for Gutenberg

Additional tools for rich text fields in Gutenberg.

laurencebahiirwa

Simple HTML Rich Text for Block Editor

Add Semantic HTML Markup to texts such as Cite, Small, Marked, Inserted and Deleted in the Block Editor.

Younes

Magic Text Block — Styles & Effects: Gradients and Tooltips

Enhance your Gutenberg editor with advanced text formatting options.

Boone Gorges

CUNY Academic Commons

BP-TinyMCE

Replaces textareas throughout BuddyPress with the TinyMCE rich text box.

Elio Rivero

ILC Rich Title

Enables TinyMCE for the title when writing a post or page.

WYSIWYG Comments with Trix Editor

This replaces the WordPress comment submission form with a WYSIWYG rich-text editor.

Toro_Unit (Hiroshi Urabe)

hamworks

Rich Text Extension

C-Metric

C-Metric – Easy Block Editor

The C-Metric Gutenberg Block plugin lets you add dynamic rich text blocks under "C-METRIC" for flexible and powerful content management on your site

Aki Hamano

<p>RichText Extension adds useful decorating features to gutenberg rich text editor.</p>
<h4>Highlighter</h4>
<p>Draw a marker on the inline text.<br />
You can set the color, thickness, and opacity of the marker to you can create various marker styles.<br />
Up to four types of settings can be made.</p>
<h4>Font size</h4>
<p>Change inline text size.<br />
The size is specified as a percentage of the base font size, and up to four types of settings can be made.</p>
<h4>Underline</h4>
<p>Create underline.<br />
<strong>Note: The underline specifications have changed from version 2.0.0. Try clearing the format if existing underlines do not work.</strong></p>
<h4>Clear format</h4>
<p>Removes all formatting.</p>


RichText Extension

This is by far the best approach I've seen so far on really adding something usable to the WP Gutenberg Block Editor

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