When users logged in admin area, they will see announcements first,  if users  did not accept announcements, they can not open any menu in back end.

jamiebergen

Plugin Notes Plus

Adds a column to the Plugins page where you can add, edit, or delete notes about a plugin.

yydevelopment

Page & Post Notes

Simple plugin that allow you to notes on pages and posts

Michael Ott

Notely

Create admin text notes for any post, page or custom post type.

Mohammad Jangda

Juliette Reinders Folmer

Chris Dillon

Plugin Notes

Andrea Porotti

JAMP Notes (Just Another Memo Plugin)

This plugin allows you to attach notes to some WordPress elements like posts, pages, dashboard sections and more.

jim912

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Plugin Memorandum

Plugin Memorandum makes you can write memo or notes for each plugin in the Plugins page.

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Plugin Notes Label

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AdminHero

Admin notes for website administrators, accessible via a modal that lets you write, edit, and save notes directly within the WordPress dashboard.

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StickyBoard

ログインユーザーがWebページに付箋を追加できるようにするプラグイン。Create personal sticky notes on any WordPress page.

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Plugin Name: Announcements
👉 <a href="https://tooltips.org/product/announcements/" rel="nofollow ugc">Free Download</a> | <a href="https://tooltips.org/wordpress-tooltip-plugin/announcements/" rel="nofollow ugc">Announcements Document</a> | <a href="https://tooltips.org/contact-us/" rel="nofollow ugc">404s Support</a>| <a href="https://tooltips.org/forums" rel="nofollow ugc">Support Forums</a>
Announcements is a simple & easy-to-use solution that help you to show / edit / add / delete announcements in your admin area, if user logged in your admin area, they will see all announcements first, 
if logged in users do not accept your announcements, they can not open any menu or links in your wordpress back end, the only page they can view is your announcements in back end. This plugin can help you show TOS or Notes for any users when they logged in your back end
In Announcements setting panel, you will add title, message in Announcement Message Editor, also there are options that allow users view an announcement and do not need to access the agreement, and still can open admin menu or links, all these announcements will be stored 
in Announcements menu, if users open announcements menu, they will find any messages / notes you sent to them.
Announcements setting panel, you can add / edit / delete any announcements very easy.
More amazing features are being developed and any feature request is welcome.
Feature request & Support URI: https://tooltips.org/forums 
<h3>Download</h3>
https://wordpress.org/extend/plugins/announcements/

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