Time Clickers - Time Clickers is an Awesome, Free-to-play, Action, Clicker, Role-playing, FPS, and Single-player video game developed and published by Proton Studio Inc.
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.
Clicker Monsters - Clicker Monsters is an incredible, Action, Arcade, Clicker, Role-playing and Single-player video game developed and published by Appartans.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Clicker Heroes - The idle RPG that started it all, tap to attack monsters, hire and level up heroes!
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.