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