Kishores

This is a WordPress plugin which helps in adding 
an option to your posts to enable display of more than one author-name on a post on WordPress.
<a href="http://opentuteplus.com/wordpress-post-contributors/" rel="nofollow ugc">Demo:</a>
TODO : Ajax filter for showing author on dashboard.
<h3>Arbitrary section</h3>

WordPress Post Contributors

Add an option to your posts to enable display of more than one author-name on a post on WordPress.

Shadi G شادي جـ

This plugin allows you to seamlessly add guest authors or contributors to your WordPress posts, specifically within block themes (Full Site Editing). Guest authors/contributors created with this plugin function identically to regular user authors, complete with dedicated archive pages showcasing all their content.
<h4>Key Features</h4>
✅ Effortless Guest Contributor Integration: Add guest authors/contributors to your posts without creating user accounts. They’ll function just like regular authors. 
✅ Dedicated Author Archives: Each guest author will have their own archive page displaying all their published posts. 
✅ Multiple Post Guest Author or Contributor Support: Have a variety of guest authors/contributors? No problem! This plugin allows for the addition of multiple guest authors/contributors. 
✅ Multiple Roles Support: Have a variety of post contributtor (author, fact-checker, etc)? No problem! This plugin allows for the assingment of multiple roles for contributors. 
✅ Ability to support any post type: You can chose which post type to add this feature to. 
✅ One click migratiion from PublisherPress Authors: You can migrate on one click from PublisherPress Authors. Migration from other plugins will be included in new releases soon.
<h4>Othor</h4>
You can use the <code>mshmn_all_post_author_names</code> custom field (post meta) to retrieve all primary authors or contributors assigned under the default role. 
A common use case is when you want to define a custom schema.org configuration for a post type, and want to set the post author attribute.

Musahimoun – Multiple Authors, Guest Authors & Contributors for WordPress Block Themes

This plugin allows you to choose an author, create a guest author or choose multiple authors and contributors..

WordPress Post Contributors vs Musahimoun – Multiple Authors, Guest Authors & Contributors for WordPress Block Themes