PublishPress is a really useful WordPress plugin that our team have been working on as a side project.
The plugin is designed for any WordPress site with multiple team members. We developed it to help keep ourselves organized on a busy site with lots of writers creating lots of content. The slogan of the plugin is "WordPress for Teams".
The main feature is a big editorial calendar. You can create, reschedule and plan content from a single screen.
There are also some intro videos to help understand more about PublishPress. Thanks to Brian Hogg for creating this.
How to Organize Your WordPress Content
This second video explains how to use PublishPress to organize your content:
How to Send Notifications for WordPress Content
This third video explains how to use PublishPress to send notifications when your content is updated: