App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
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.
AppLock (FOSS) - A privacy App lock FOSS application.
Android Lost - Remotely control your Android phone from the internet or by SMS. Features:
Hexlock - Security app locker keeps apps private with smart profiles for any situation
iLostFinder - iLostFinder is an anti-theft/lost app for iPhone and iPad.