Find My - Find My can help you locate your devices and your friends and family.
KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
Prey - Prey is the simplest and most reliable solution for tracking, data protection & management for Windows, Mac, and mobile devices. Track with precise location, wipe, reset and secure devices across all platforms.
App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
PhoneTrack - Nextcloud app to create tracking sessions to display phones position in real time and export activity to gpx.
AppLock (FOSS) - A privacy App lock FOSS application.