"For anyone that applies Agile and Scrum workflows to their process, the Screenful Power-Up is the dashboard of your dreams"
Screenful Power-Up is an extension to Trello that turns Trello into a powerful agile workflow tool. It lets you to track your key metrics, and create sprints and milestones right within the Trello UI.
You can activate the Power-Up from the right side menu of your Trello board. Click open Power-Ups and scroll down to Screenful. Click enable and you're ready to go! Here's a quick video to see it in action: