Next Step for Trello - Check tasks directly from your Trello boards
Calamari - Calamari helps organizations, companies, and enterprises to manage their human resources in an easy and compliant way by delivering modern and easy-to-use time tracking and attendance management tools.
OutlookTime - OutlookTime is a time tracking system that turns Outlook into a timesheet system.
Sage HR - Sage HR is a one-stop shop for your HR management needs. Your HR - simplified!
Punchtime - Nifty time tracking for Trello users and teams
TimeOffManager - TimeOffManager.com provides a fully automated online system for tracking and managing employee absence, leave, paid time-off and attendance.