Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Wherezat - Wherezat is Fast, free, and easy way to share your location with your friend or family.
OwnTracks - Cross-platform location sharing
Companion - Never walk home alone
CircleCare - Family App to Motivate Everyone