It's modern and clean style for Trello. And not only.
Chuck Enhancements for Trello
Tiny enhancements for Trello
List Highlighter for Trello
Highlights todo, doing and done lists.
Parent/Child Management for Trello
Add support of Parent/Child dependencies in Trello projects.
Track+ and Trello Extension
Helper to work with Track+ and Trello
Hide Activity Details (+ Tweaks) for Trello
Hides activity details on Trello cards. Can now also be set to hide completed checklist items
Simple time tracking extension which helps you be more productive, complete projects in time and bill your clients correctly.
Ref provides powerful auto-suggest and @mentioning for your gmail and google apps.