Plugger - Find nearby places to charge your devices
Android Lost - Remotely control your Android phone from the internet or by SMS. Features:
ANKR - Finally a stuff-tracker with smart notifications
Find My - Find My can help you locate your devices and your friends and family.
Openoy - Find what's open near you.
PhoneTrack - Nextcloud app to create tracking sessions to display phones position in real time and export activity to gpx.