Thyme - The task timer for OS X.
Dial - Quick & beautiful macOS timer.
XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
wnr - Better than pomodoro, this timer app balances work and rest.
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.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.