The PublishPress Authors plugin allows you to add many authors to one WordPress post.
PublishPress Capabilities is trusted to manage the permissions for over 100,000 WordPress sites.
Using PublishPress Checklists, you can define tasks that must be completed before your content is published.
PublishPress Planner helps you organize, schedule and plan your WordPress content.
PublishPress Permissions allows you to customize your WordPress permissions in very advanced ways.