Stellarium - Stellarium is a free open source planetarium for your computer.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
KStars - KStars is a Desktop Planetarium for KDE.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.
Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.