Zabbix - Track, record, alert and visualize performance and availability of IT resources
Next Step for Trello - Check tasks directly from your Trello boards
Statista - The Statistics Portal for Market Data, Market Research and Market Studies
OutlookTime - OutlookTime is a time tracking system that turns Outlook into a timesheet system.
Montecarlito - MonteCarlito is a free Excel-add-in to do Monte-Carlo-simulations.
Punchtime - Nifty time tracking for Trello users and teams