Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
Mapple.me - Mapple.me bridges the gap between available time and availability of friends to increase social...
Quake - Quake is a series of first-person shooter video games released by id Software.
OwnTracks - Cross-platform location sharing
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.