Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Companion - Never walk home alone
OwnTracks - Cross-platform location sharing
Iris - The fastest web framework for Go in (THIS) earth