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Radar - Radar - Location sharing for friends and teams.
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
HyperTrack - Build logistics apps that feel like the future
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address
OwnTracks - Cross-platform location sharing