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.
ANNO - ANNO is a city-building and economic simulation video game series, with real-time strategy elements.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
The Settlers Online - The Settlers is a free web browser based strategy game along with a gameplay that drops anywhere between Age of Empires and the online strategy style.