nicksmit

AdminNotes allows administrators and editors to add formatted notes to posts and pages. These notes can serve as reminders, tasks, or recommendations for content editors. Additionally, when enabled, users are notified to read these admin notes before editing the content.
Features: 
– Add formatted notes using a rich text editor in both Classic and Gutenberg editors. 
– Display a notification message to users when editing a post or page if admin notes are present. 
– Option to enable or disable the notification on a per-post/page basis.

AdminNotes

Adds an admin notes block to post and page editing screens with formatted text support and user notifications.

MD.Ridwan

Plugmint – Draggable Admin Notes lets you create and organize custom notes directly inside the WordPress admin dashboard. 
Each note is fully draggable and can include simple checklists for task management. 
Note items can be draggable from one note to another note. 
Checkmark them after completing the task.
Perfect for site managers, content editors, and teams who want a simple way to keep reminders and to-dos inside the admin panel.
Key features:
<ul>
<li>Create unlimited notes</li>
<li>Drag and drop notes anywhere on the dashboard</li>
<li>Add checklist items inside notes</li>
<li>Checklist items are also draggable and can be moved from one note to another note</li>
<li>Choose note colors for better organization</li>
<li>Show/hide notes by user (optional)</li>
<li>Lightweight — no external libraries except jQuery UI</li>
<li>Fully responsive and compatible with all admin themes</li>
</ul>
This plugin does not store data outside your website and does not communicate with external servers.
<h3>How it works</h3>
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Plugmint – Draggable Admin Notes

Create draggable admin notes with checklists inside your WordPress dashboard. Easily organize important tasks or reminders.

AdminNotes vs Plugmint – Draggable Admin Notes