Scrum for Trello - Adds functionality to Trello boards for your Scrum projects.
Ollert - Learn what your Trello boards aren't telling you
Scrum Study Cards - An easy to understand overview of the Scrum framework.
Vacation Tracker - The easiest way to track your team’s vacations and days off.
MacMenuBar - A curated directory of 200+ Mac menu bar apps
Punchtime - Nifty time tracking for Trello users and teams