Stach Redeker

Page Notification Email puts and end to manually informing stakeholders when a page is changed. The plugin adds a meta box to the edit page that allows the editor to enter one or more email addresses. Press the button to send an email to the inputted email addresses directly from the WordPress back-end. The email text is set globally from a WordPress settings page.
<h3>Use Cases</h3>
<ul>
<li>Editorial Workflow Notification: Notify team members when content needs review or updating.</li>
<li>Marketing & Outreach: Forward content pages to stakeholders or marketing team members for feedback and review.</li>
</ul>
<h3>License</h3>
This plugin is free software; you can redistribute it and/or modify it under the terms of the GNU General Public 
License as published by the Free Software Foundation; either version 3 of the License, or any later version.

Page Notification Email

Eliminate manual notifications. Page Notification Email lets editors send update emails from WordPress.

Jeff Starr

Restores the Custom Field meta box for the Gutenberg Block Editor.
Update: This plugin currently is not needed, as WordPress version 5.0+ displays Custom Fields natively. Just click the settings button (three dots) and go to Options, where you will find the option to display the Custom Fields meta box. So this plugin still works great, but it is recommended to use native WP custom fields instead. For more information, read <a href="https://wordpress.org/support/topic/please-read-7/" rel="ugc">this post</a>.
Features
<ul>
<li>Easy to use</li>
<li>Clean code</li>
<li>Built with the WordPress API</li>
<li>Lightweight, fast and flexible</li>
<li>Works great with other WordPress plugins</li>
<li>Plugin options configurable via settings screen</li>
<li>Focused on flexibility, performance, and security</li>
<li>One-click restore plugin default options</li>
<li>Translation ready</li>
</ul>
Options
<ul>
<li>Specify the post types that should display custom fields</li>
<li>Exclude custom fields that are protected/hidden</li>
<li>Exclude custom fields with empty values</li>
<li>Exclude specific custom fields by name</li>
</ul>
Planned Features
<ul>
<li>Ajaxify adding of new Custom Fields</li>
<li>Ajax method to Delete custom fields</li>
</ul>
Privacy
This plugin does not collect or store any user data. It does not set any cookies, and it does not connect to any third-party locations. Thus, this plugin does not affect user privacy in any way.
Custom Fields for Gutenberg is developed and maintained by <a href="https://x.com/perishable" rel="nofollow ugc">Jeff Starr</a>, 15-year <a href="https://plugin-planet.com/" rel="nofollow ugc">WordPress developer</a> and <a href="https://books.perishablepress.com/" rel="nofollow ugc">book author</a>.
Support development
I develop and maintain this free plugin with love for the WordPress community. To show support, you can <a href="https://monzillamedia.com/donate.html" rel="nofollow ugc">make a donation</a> or purchase one of my books:
<ul>
<li><a href="https://wp-tao.com/" rel="nofollow ugc">The Tao of WordPress</a></li>
<li><a href="https://digwp.com/" rel="nofollow ugc">Digging into WordPress</a></li>
<li><a href="https://htaccessbook.com/" rel="nofollow ugc">.htaccess made easy</a></li>
<li><a href="https://wp-tao.com/wordpress-themes-book/" rel="nofollow ugc">WordPress Themes In Depth</a></li>
<li><a href="https://books.perishablepress.com/downloads/wizards-collection-sql-recipes-wordpress/" rel="nofollow ugc">Wizard’s SQL Recipes for WordPress</a></li>
</ul>
And/or purchase one of my premium WordPress plugins:
<ul>
<li><a href="https://plugin-planet.com/bbq-pro/" rel="nofollow ugc">BBQ Pro</a> – Blazing fast WordPress firewall</li>
<li><a href="https://plugin-planet.com/blackhole-pro/" rel="nofollow ugc">Blackhole Pro</a> – Automatically block bad bots</li>
<li><a href="https://plugin-planet.com/banhammer-pro/" rel="nofollow ugc">Banhammer Pro</a> – Monitor traffic and ban the bad guys</li>
<li><a href="https://plugin-planet.com/ga-google-analytics-pro/" rel="nofollow ugc">GA Google Analytics Pro</a> – Connect WordPress to Google Analytics</li>
<li><a href="https://plugin-planet.com/head-meta-pro/" rel="nofollow ugc">Head Meta Pro</a> – Ultimate Meta Tags for WordPress</li>
<li><a href="https://plugin-planet.com/simple-ajax-chat-pro/" rel="nofollow ugc">Simple Ajax Chat Pro</a> – Unlimited chat rooms</li>
<li><a href="https://plugin-planet.com/usp-pro/" rel="nofollow ugc">USP Pro</a> – Unlimited front-end forms</li>
</ul>
Links, tweets and likes also appreciated. Thanks! 🙂

Custom Fields for Gutenberg

If you are searching for the solution to display custom fields like they were displayed before Gutenberg - in native wp meta box - this is solution for you. 

Displays old native interface for Custom Fields

This plugin does one thing and does it well. This is how all plugins should be!

Good plugin by a top dev

Restores the Custom Field meta box for the Gutenberg Block Editor.

Page Notification Email vs Custom Fields for Gutenberg