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.

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

myPoli - Gameified to-do list and habit tracker.

ATracker - ATracker app allows you to track your time in a few simple steps and can view full daily, weekly, and monthly reports at a glance.

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

ManicTime - Track your computer usage and use collected data to accurately tag time.