WOVER - An intelligent personal emergency platform
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Facebook Safety Check - Connect with friends and loved ones during a disaster
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Crisis Response on Facebook - Find more information about crises and crisis response tools
OwnTracks - Cross-platform location sharing