authors – The unofficial WordPress Plugin Directory

GhostWriter

Ghostwriter overrides WordPress’s author pages and feeds to emulate the full functionality provided to WordPress users.

Show the reading time and number of words in your post.

Builds post widget based on options you choose from a form in a widget

Export Comment Authors lets you extract the Names, Email Addresses and more of your Comment Authors into a CSV file.

Add an Co-Authors facet to FacetWP

Plugin provides a widget for displaying avatars of registered users.

Using WordPress Custom Fields, and without editing any template files, lets you credit all authors on collaboration posts.

Authors for categories, tags, and other taxonomy terms

This very simple plugin allows multiple authors to be assigned to a Post or Page.

Post Co-Authors plugin allows you to select more then one authors in any post or custom post type.