Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
AMPLI.FI - Live online music community. Twitch for tunes.
Quake - Quake is a series of first-person shooter video games released by id Software.
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Blattarco - Creative self-developement for musicians of all level.