Daryll Doyle

This plugin creates a custom news feed that can be read by the <a href="https://wordpress.org/plugins/dashboard-custom-feed/" rel="ugc"><code>Dashboard Custom Feed</code></a> plugin. News items are added through a custom post type called DCF Updates
This is mainly useful for notifying all your clients of something through their wordpress dashboard, whether that be a link to a new blog you’ve written or a notification asking everyone to upgrade their versions of wordpress. It’s really up to you what you show in there.

Dashboard Custom Feed Admin

Creates a custom post type to power a custom news feed

Amit Singh

oceanwp

Generates an unlimited number of sidebars and place them on any page you wish. Go to Theme Panel > Sidebars to create your custom sidebars. 
This plugin requires the <a href="https://oceanwp.org/" rel="nofollow ugc">OceanWP</a> theme to be installed.

Ocean Custom Sidebar

This little free plugin allowed me to easily add any Elementor Library Item to any menu in any area. Show video's, products, forms anything you like in your menu's of sidebars.

Really, REALLY useful!

Do NOT underestimate it's power!

Generates an unlimited number of sidebars and place them on any page you wish. Go to Theme Panel > Sidebars to create your custom sidebars.

Dashboard Custom Feed Admin vs Ocean Custom Sidebar