Android Lost - Remotely control your Android phone from the internet or by SMS. Features:
Facebook Safety Check - Connect with friends and loved ones during a disaster
Find My - Find My can help you locate your devices and your friends and family.
WOVER - An intelligent personal emergency platform
PhoneTrack - Nextcloud app to create tracking sessions to display phones position in real time and export activity to gpx.
Crisis Response on Facebook - Find more information about crises and crisis response tools