Andrea Porotti

Using this plugin you can attach notes to some elements in the WordPress dashboard, such as:
<ul>
<li>posts</li>
<li>pages</li>
<li>custom post types from other plugins (except the notes from this plugin)</li>
<li>users</li>
<li>plugins</li>
<li>dashboard sections</li>
<li>the whole dashboard</li>
</ul>
It can be helpfull if you manage a site with other people or just to take notes for yourself.
Features
<ul>
<li>manage notes like the standard posts by opening the Notes page from the admin menu.</li>
<li>while editing a note, use the meta box on the right to set note properties (position, color,…)</li>
<li>manage section and global notes from the admin bar.</li>
<li>manage item notes (eg. posts and pages) from the custom column in the admin pages.</li>
<li>get notes details by hovering the mouse on the “Info” links or clicking on the “I” icons.</li>
<li>add text, images and links in the note content.</li>
<li>deleted notes go to the trash, so they can be restored.</li>
<li>automatically discovers custom post types added by other plugins (eg. events, books…).</li>
<li>creates a list of the dashboard sections based on the admin menu items.</li>
</ul>
Configuration
Settings for the plugin are available on the Settings -> JAMP Notes page.
Please note:
<ul>
<li>by default the plugin data is kept after uninstall. You can choose to delete notes and settings enabling the data removal option.</li>
<li>after activation, the plugin enables notes for all the existing public post types. If you then install other plugins which create new post types, you have to manually enable them in the JAMP settings.</li>
</ul>
Permissions
The notes are currently available only for the users with the “Administrator” role. 
Each Administrator can manage all notes.
Support
If you find any errors or compatibility issues with other plugins, please let me know in the support forum. Thanks!
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 services.

JAMP Notes (Just Another Memo Plugin)

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

ネトデジ編集部

StickyBoardは、WordPressサイトの任意のページに付箋を追加できるプラグインです。ログインユーザーのみが使用でき、付箋はユーザーごとに個別に保存されます。サイトを閲覧しながらメモを取ったり、重要な情報をマークしたりするのに最適です。
主な機能:
<ul>
<li>サイト上の任意の場所に付箋を追加</li>
<li>ドラッグアンドドロップで付箋を移動</li>
<li>5色の付箋（黄、緑、青、ピンク、紫）</li>
<li>テキスト内のURLを自動的にリンクに変換</li>
<li>管理画面からすべての付箋を一覧表示・管理</li>
<li>付箋の表示は作成者のみ（他のユーザーには表示されません）</li>
</ul>
使い方:
<ol>
<li>プラグインをインストールして有効化</li>
<li>サイトの任意のページに移動</li>
<li>画面右下（または設定により左下）のツールバーの「+」ボタンをクリック</li>
<li>付箋を配置したい場所をクリック</li>
<li>メモを入力（自動保存されます）</li>
</ol>
For English Users:
StickyBoard allows logged-in users to add sticky notes to any page on your WordPress site. Notes are private to each user and can be placed anywhere on the page. Perfect for taking notes while browsing or marking important information.
Key Features:
<ul>
<li>Add sticky notes to any position on your site</li>
<li>Drag and drop to move notes</li>
<li>5 color options (yellow, green, blue, pink, purple)</li>
<li>Automatic URL linking in note text</li>
<li>Manage all your notes from the admin dashboard</li>
<li>Notes are visible only to their creator</li>
</ul>
<h3>Additional Info</h3>
開発者情報:
当プラグインはミニクル合同会社によって開発・メンテナンスされています。 
サポートや質問については、公式サイトをご覧ください: <a href="https://minikuru.co.jp" rel="nofollow ugc">https://minikuru.co.jp</a>
For English Users:
This plugin is developed and maintained by MINIKURU LLC. 
For support and inquiries, please visit our official website: <a href="https://minikuru.co.jp" rel="nofollow ugc">https://minikuru.co.jp</a>

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.

JAMP Notes (Just Another Memo Plugin) vs StickyBoard