Andrew DS a11n

This plugin allows you to tag people and objects in your images by selecting a region of the image and add names, URLs and descriptions. Implements the jQuery-Notes plugin by Lukas Rydygel (http://jquery-notes.rydygel.de/) and the jQuery-autocomplete plugin by Dylan Verheul (http://code.google.com/p/jquery-autocomplete/).
See the <a href="http://www.alleba.com/blog/2010/09/29/wordpress-plugin-wp-pic-tagger/" rel="nofollow ugc">WP Pic Tagger homepage</a> for more complete and detailed information.
<h3>Usage</h3>
<h4>Enabling Tags on an Image</h4>
To tag an image, you need to assign the class “wp-tag-people-abc” or “wp-tag-objects-xyz” to your images through your blog’s HTML editor. ‘abc’ and ‘xyz’ must be unique strings of text to identify an image. Simply use the ‘Tag People’ or ‘Tag Objects’ buttons found in the editor to easily insert these tags.
To tag people, click the ‘Tag People’ button. This type of tag allows you to insert names of people and their website or blog URLs. The URL field may be left empty.
If you wish to tag objects, click the ‘Tag Objects’ button. This tag allows you to add only textual notes or descriptions.
Some samples:

If you have more than one image in your post, they must be assigned different classes:

Do not assign more than one class to an image, such as this:

Doing so will disable the tagging feature.
<h4>Tagging the Images</h4>
After writing your post, publish it or save it as draft. View or preview the blog post. You will notice that each of your images assigned with the required classes are loading tags. To begin tagging, click the button with the plus (+) sign found below the image.
Click on the image. Drag and resize the tag box to your desired location and size. To save the tag, click on the button with the check mark to save it.
To edit or delete a tag, right-click on the tag to make the necessary changes.
<h3>License</h3>
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation.

WP Pic Tagger

Tag, caption, annotate pictures and images on your Wordpress blog.

claraeliz

Claraeliz Team Notes lets admins and editors leave draggable sticky notes directly on the frontend of any WordPress page. Notes are anchored to the nearest semantic HTML element so they stay in the right position across different screen sizes and viewport widths.
Features: 
* Add notes directly from the admin bar on any page — no page reload required 
* Notes are anchored to the nearest semantic element using the rendered text bounding box (<code>getClientRects()</code>), not the container width 
* Position is saved as an offset from the actual text edge — so notes stay next to the right word even when text reflows across viewport widths 
* Notes reposition automatically when the layout changes (window resize, orientation change) 
* Role-based note colors: neon pink for admins, neon blue for editors/authors/contributors 
* Share notes with specific users using the visibility (eye) icon on each note 
* Only the note author can drag, edit, delete, or share their notes 
* Other logged-in users can view notes that have been shared with them 
* Manage and bulk-delete your notes from the My Notes dashboard in the admin panel 
* Works with Gutenberg, Elementor, and standard PHP templates 
* Hidden on screens smaller than 1280px
Note colors by role: 
* Administrator — neon pink (#b408a6) 
* Editor, Author, Contributor — neon blue (#5b8cff) 
* Text is always white on both colors for readability
Who can add notes: 
* Administrator — can create, edit, drag, delete, and share notes 
* Editor, Author, Contributor — can create, edit, drag, delete, and share notes 
* Other roles (Subscriber, etc.) — can only view notes that have been shared with them; cannot create notes
Sharing notes: 
Click the eye icon (👁) on any note you own to open the sharing popover. Check the users you want to share the note with — the selection is saved automatically. Shared users will see the note on the same page the next time they visit it while logged in.
Managing notes: 
Visit My Notes in the WordPress admin sidebar to see a list of all notes you have created. You can delete notes individually or use the bulk action to delete multiple notes at once. Each user only sees their own notes in this dashboard.

Claraeliz Team Notes

Draggable sticky notes for logged-in collaborators. Leave notes anywhere on any page, anchored to page elements.

WP Pic Tagger vs Claraeliz Team Notes