Postcollab Toolkit allows you to assign multiple contributors to a WordPress post in addition to the main author.
Editors can select contributors from registered users directly from the post editor. Selected contributors are automatically displayed on the front end with their Gravatars and links to their author archive pages.
The plugin is lightweight, developer-friendly, and follows WordPress coding standards.
The selected contributors will appear at the bottom of the post on the front end.
wpcb_get_metabox_contributors
Modify the list of users shown in the Contributors metabox.
wpcb_pre_save_contributors_ids
Filter contributor IDs before saving.
wpcb_get_contributors_ids
Filter contributor IDs before displaying on the front end.
wpcb_contributors_list_template
Override the template used to display contributors.
wpcb_after_contributors_savedThis plugin is licensed under the GNU General Public License v2.0 or later.
https://www.gnu.org/licenses/gpl-2.0.html