Takaitra

A widget to display a list of authors in your WordPress blog. Includes widget options to configure the features mentioned below. Completely updated to use the new widget API and is multi-widget enabled. Fully XHTML compliant.
<h4>Features:</h4>
<ul>
<li>Choose between an HTML list or comma-separated list.</li>
<li>Can show number of published author posts.</li>
<li>Sort authors by name or by post count.</li>
<li>Exclude users below a given post count threshold.</li>
<li>Allows administrator to be excluded from the list.</li>
<li>Choose between displaying usernames or full names in the list.</li>
<li>Can include links to author-specific RSS feeds.</li>
</ul>

List Authors

A widget to display a list of site authors.

Romulo Vieira

Restrict on which categories a user can post.
It also blocks the users from creating/editing/deleting categories.
Only Admins can set other user’s categories.
Works with Block Editor and Classic Editor.
It’s compatible with IE11.

Restrict Author Categories

Restrict on which categories a user can post. Just that!

List Authors vs Restrict Author Categories