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.
Timer 7 - ⏰ 7 minute timer is the same as 7 minute countdown - you can easily set countdown alarm timer for seven minutes with just one click.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Chronograph.io - Cloud synchronized stopwatches and timers.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Horo - The best free timer app for Mac