Datitisev's Admin Dashboard Extension
This extension redesigns the admin dashboard
This extension adds a PHP version to the dashboard, as well as a user, discussion, and post count (it uses last id, not entirely accurate; post count not working at the moment, flarum/core's fault). Example:
The dashboard is extendable! Just follow the wiki page How To Add Your Own Widget, which teaches you how to create an extension from scratch just to extend the dashboard. If you already have an extension made, scroll to How To Add Your Own Widget: Creating The Widget Component.