Fixmysite

This simple, lightweight plugin solves one particular issue. WordPress doesn’t include any alt text or a title tag when using Gravatars. This addresses that by using the comment author name for each of your comment’s Gravatars, and for any other Gravatar usage it should use the authors display name.
So if you create a post it will use your name for your Gravatars Alt text and Title tag and then for the comments it will use the commenters name for their Gravatars Alt text and Title tags.
With this plugin you can squash those pesky warnings given by SEO reporting tools that look for missing alt text and title tags.
<h3>Important Notes</h3>

Fix Gravatar Alt Text & Title Tag

Applies comment author name to Gravatar's Alt and Title tags in comments and author display name to Gravatars site-wide.

Freemius

Mohamed Saad

WPSAAD

Image Alt Text Manager – Bulk & Dynamic Alt Tags For image SEO Optimization + AI

Congratulations Mohammed! great plugin :-)

Congratulations!

Great plugin, great support

Automatically bulk change images alt text to dynamic alt tags values related to content or media and also generate empty values.

Fix Gravatar Alt Text & Title Tag vs Image Alt Text Manager – Bulk & Dynamic Alt Tags For image SEO Optimization + AI