Charmstone - The quicker switcher launcher for macOS
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.
SwitchGlass - Customizable app switcher for Mac
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Witch - Welcome to the world of W. i. t. c. h.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.