WP Grim

The free Classic Editor & Classic Widgets plugin helps you to easily disable Gutenberg editor totally everywhere and enables Classic Editor and Classic Widgets.
Classic Editor and Classic Widgets plugin enables old-style WordPress Classic Editor for “Edit Post” with TinyMCE (WYSIWYG), Meta Boxes (Custom Fields), and others. Once activated, this plugin hides all functionality available in the new Gutenberg block editor.
<h3>What does this plugin do?</h3>
<ul>
<li>Disables the Gutenberg Editor</li>
<li>Enables WordPress Classic Editor</li>
<li>Enables Classic Widgets</li>
</ul>
Features
<ul>
<li>Disable Gutenberg totally</li>
<li>Disable Gutenberg for any post type</li>
<li>Editor Switcher</li>
<li>Choose Editor for each Post</li>
<li>Choose Default Editor</li>
<li>Choose Widgets Editor</li>
<li>Full Support Advanced Custom Fields (ACF)</li>
<li>Hide plugin menu item</li>
<li>Enable/Disable frontend Gutenberg styles</li>
<li>WooCommerce compatible</li>
<li>WPML Compatible</li>
<li>Polylang compatible</li>
</ul>
Also, you will be able to use old-style Classic Widgets under Appearance > Widgets and Appearance > Customize > Widgets. There is no need to setup any configuration.
<blockquote>
By default, this plugin hides all functionality available in the new Gutenberg block editor without setting up any extra options.
</blockquote>
<h3>Upgrade to Pro Version</h3>
<a href="https://wpgrim.com/classic-editor-and-classic-widgets-pro/?utm_source=wordpressorg&utm_medium=content&utm_campaign=cew" rel="nofollow ugc">Classic Editor and Classic Widgets PRO</a> plugin provides more additional features. Go to the Next Level with <a href="https://wpgrim.com/classic-editor-and-classic-widgets-pro/?utm_source=wordpressorg&utm_medium=content&utm_campaign=cew" rel="nofollow ugc">Pro Version</a>. Pro plugin works together with this Free Plugin and does not need any re-installation or deactivation of Free version.
Premium Features
<ul>
<li>Choose Editor for User Roles</li>
<li>Choose Editor for Custom Post Types</li>
<li>Remember Last used Editor</li>
<li>Displaying Post States</li>
<li>Exclude Posts/Pages by Autocomplete</li>
<li>Premium Support</li>
</ul>
⭐ <a href="https://wpgrim.com/classic-editor-and-classic-widgets-pro/?utm_source=wordpressorg&utm_medium=get_pro&utm_campaign=cew" rel="nofollow ugc">Get PRO Version Now</a>
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Developed with love by <a href="https://wpgrim.com/?utm_source=wordpressorg&utm_medium=direct&utm_campaign=cew" rel="nofollow ugc">WP Grim</a>

Classic Editor and Classic Widgets

Disables Gutenberg editor totally everywhere and enables Classic Editor and Classic Widgets.

Pieter Bos

gschoppe

<blockquote>
GDPR-compliant: does not collect any user data
</blockquote>
The free “Classic Editor +” plugin is targeted at everyone who does not want to use the WP Block Editor (Gutenberg), introduced in WordPress 5.0. Install it now on sites and the UX remains the same as you are used to without redundant styling being added to the frontend of your site!
What’s New: 
Removes WP Patterns
This plugin simply disables the WP Block Editor, removes any and all styling from both front- and backend and disables the block editor for widgets too.
And if WooCommerce and/or WPML are installed on the site, “Classic Editor +” removes the block styles of those plugins too.
There are no Settings, it simply does what it says on the label.
Therefore I highly recommend installing this “Classic Editor +” plugin.
I support this plugin exclusively through <a href="https://github.com/senlin/classic-editor-addon/issues" rel="nofollow ugc">Github</a>. Therefore, if you have any questions, need help and/or want to make a feature request, please open an issue here. You can also browse through open and closed issues to find what you are looking for and perhaps even help others.
Thanks for your understanding and cooperation.
If you like the “Classic Editor +” plugin, please consider leaving a <a href="https://wordpress.org/support/view/plugin-reviews/classic-editor-addon?rate=5#postform" rel="ugc">review</a>. Thanks!
“Classic Editor +” by <a href="https://so-wp.com/plugin/classic-editor-addon" rel="nofollow ugc">Pieter Bos</a> and <a href="https://gschoppe.com" rel="nofollow ugc">Greg Schoppe</a>.

Classic Editor +

The "Classic Editor +" plugin disables the block editor, removes enqueued scripts/styles and brings back classic Widgets.

Classic Editor and Classic Widgets vs Classic Editor +