Find My - Find My can help you locate your devices and your friends and family.
iKeyMonitor - iKeyMonitor is a mobile app for both iPhone and Android devices that with parental control capabilities and phone monitoring features.
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.
FlexiSPY - FlexiSPY is the original "phone spy" software - it's been on the market since 2005.
Android Lost - Remotely control your Android phone from the internet or by SMS. Features:
PhoneTrack - Nextcloud app to create tracking sessions to display phones position in real time and export activity to gpx.