Countdown Screensaver - A Mac screensaver for counting down to a date 🖥🕐

Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.

Timetaco - Create your own countdowns, as easy as 3, 2, 1

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.

Yonks - Day counter app for iOS & Android.

Pomodone - Pomodone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service.