Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
LockOnMe - LockOnMe is a location-sharing app, displaying targets and associated Points Of Interest on maps & fun radars.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
OwnTracks - Cross-platform location sharing
Xaddress - Give 7 billion people an instant physical address
Companion - Never walk home alone