Marcelo Pedra

AMPM Dashboard Admin Note adds an “Important Note” widget to the WordPress Dashboard (wp-admin → Dashboard). Only administrators (capability <code>manage_options</code>) and (in Multisite) Super Admins can view and edit it.
Features:
<ul>
<li>Visual editor (TinyMCE) inside the dashboard widget.</li>
<li>AJAX saving with feedback (“Saving…” label + spinner).</li>
<li>Strict sanitization via allowlist (wp_kses) and limited inline styles (color, background-color, text-align).</li>
<li>Links forced to <code>target="_blank"</code> with <code>rel="nofollow noopener noreferrer"</code>.</li>
<li>Widget severity/color: Neutral / Info / Warning / Error.</li>
<li>Shows: “Modified by: user_login (Display Name. ID: X) — date/time” using the site timezone configured in WordPress.</li>
<li>Multisite-friendly: stored per site (blog) by default.</li>
</ul>
<h3>Translations</h3>
<ul>
<li>English (Default)</li>
<li>Spanish (Español)</li>
<li>Argentinean Spanish (Español de Argentina)</li>
<li>Dutch (Nederlands)</li>
<li>French (Français)</li>
<li>German (Deutsch)</li>
<li>Italian (Italiano)</li>
<li>Portuguese (Português brasileiro)</li>
</ul>

AMPM Dashboard Admin Note

Displays a single admin-only Dashboard widget (“Important Note”) with TinyMCE editing and AJAX save.

shawfactor

LH Dashboard Notes allow you to insert noes on your wp-admin dashboard for your users using the post editor interface. If this plugin is network activated the insertion and editing of these dashboard notes is centralised on the main site of your multisite install. Allowing you to set Dashboard notes that are viewed throughout your multisite network.

LH Dashboard Notes

Allows you to create and edit notes that appear on the admin dashboard

AMPM Dashboard Admin Note vs LH Dashboard Notes