George Pattichis

Automatically optimize images for SEO by generating alt text, titles, captions, and descriptions from filenames. Improves search rankings and accessibility.
Key Features: 
* Auto-generate image attributes from filenames for new uploads 
* Bulk update unlimited existing images with one click 
* Auto-insert title attributes into post HTML 
* Pre-Filter filename characters (hyphens, underscores, numbers, etc.) 
* Universal Support: Works with all WP editors (Classic, Block, Gutenberg)

Simple Image Meta Generator

Generate image meta data automatically. Add alt text, titles, captions and descriptions from filenames. Bulk update existing images.

pixelgrade

George Olaru

Andrei Lupu

With <a href="https://github.com/pixelgrade/pixfields" rel="nofollow ugc">PixFields</a> you can have a custom fields visual manager.
Note: this plugin does not add any style to the output of custom fields. Its just adding metadata and offers a way to overwrite the html from the theme. 
The theme should style the output of the metadata.

PixFields

PixFields offers you a nice interface to add custom metadata into your favorite post type.

Simple Image Meta Generator vs PixFields