Ollert - Learn what your Trello boards aren't telling you
SmallDevTools - Handy developer tools with a delightful interface
Vacation Tracker - The easiest way to track your team’s vacations and days off.
Google Open Source - All of Googles open source projects under a single umbrella
Punchtime - Nifty time tracking for Trello users and teams
whatdevsneed - This is whatdevsneed.