Elegantt for Trello - The most elegant way to manage your Trello projects
WiseTime - Web-based automatic time tracking software
Hello Epics for Trello - Simplify your Trello board with parent/child relationships
Minutes - Minutes - Automatic efficient time tracking and time accounting software for lawfirms
TunnelVision - See your next Trello tasks every time you open a browser tab
OutlookTime - OutlookTime is a time tracking system that turns Outlook into a timesheet system.