Timing - Timing is the best way to keep track of the time you spend with your Mac.
Clocks - A minimal world clock app for your Mac's menubar
Time 2 - Stay focused and crush procrastination
Spacetime - Work hour and time zone management for distributed teams.
Time Tracking for Freelancers - A simple, fully integrated time tracker for freelancers
Every Time Zone - Online tool for keeping up with times around the world.