Foursquare - Foursquare is all about helping you find new ways to explore your city.
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.
iSharing - iSharing is an app that provides a real-time GPS location tracking service for family, kids and closed friends.
OwnTracks - Cross-platform location sharing