App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
NetGuard - NetGuard
AppLock (FOSS) - A privacy App lock FOSS application.
AFWall+ - AFWall+ (Android Firewall +) - iptables based firewall for Android
Hexlock - Security app locker keeps apps private with smart profiles for any situation
Mobiwol - Mobiwol is a NoRoot Firewall