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.

Pleaseup.com

Image Hotspots by Pleaseup is a responsive image hotspot plugin that lets you add interactive image maps, tooltips, and annotations to any image with a visual drag & drop editor.
<h3>External services</h3>
This plugin contacts third-party services in two distinct flows. Both flows are triggered only by an authenticated editor (with <code>edit_posts</code>) pasting a URL inside a tooltip; no data leaves the site automatically.
Server-side oEmbed resolution (<code>wp_oembed_get</code>)
When the editor pastes a URL from one of the supported oEmbed providers into a tooltip, the plugin calls the provider’s oEmbed endpoint server-side via WordPress core’s <code>wp_oembed_get()</code> to retrieve the embed HTML. The URL pasted by the editor is sent to the provider; no other data is sent. Supported providers:
<ul>
<li>YouTube — Terms: https://www.youtube.com/t/terms — Privacy: https://policies.google.com/privacy</li>
<li>Vimeo — Terms: https://vimeo.com/terms — Privacy: https://vimeo.com/privacy</li>
<li>Spotify — Terms: https://www.spotify.com/legal/end-user-agreement/ — Privacy: https://www.spotify.com/legal/privacy-policy/</li>
</ul>
Client-side iframe rendering
When a tooltip containing an oEmbed iframe is opened on a public page, the visitor’s browser loads the iframe directly from the provider’s CDN (e.g. <code>youtube.com</code>, <code>player.vimeo.com</code>, <code>open.spotify.com</code>). This is standard browser behavior for any embedded media; the plugin does not add any tracking on top.
The set of allowed iframe hosts is filterable via the <code>wphs_allowed_iframe_hosts</code> filter. Hosts not in the allowlist are stripped from tooltip HTML on save.

Image Hotspots by Pleaseup – Interactive Image Map & Tooltips

Interactive image hotspots with drag & drop editor. Add tooltips, annotations, and image maps. Works with Gutenberg, ACF, and galleries.

WP Pic Tagger vs Image Hotspots by Pleaseup – Interactive Image Map & Tooltips