Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
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.
Quake - Quake is a series of first-person shooter video games released by id Software.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.