Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Effortless - Stay focused and beat procrastination on your Mac.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Memory by Timely - An intelligent timeline of everything you did in a day.
Hubstaff - Simple yet powerful employee work tracker with screenshots, timesheets, billing, in-depth reports, and more. Understand productivity issues and act on them.