Ollert - Learn what your Trello boards aren't telling you
whatdevsneed - This is whatdevsneed.
SendBoard for Trello - Receive and reply to emails in Trello
SmallDevTools - Handy developer tools with a delightful interface
Smartlook - Qualitative analytics for websites and mobile apps Start understanding the 'whys' of your users' behaviors with clear, visual insights. With session recordings and event tracking, you get the complete picture.
Utilso - All-in-one tools for developers