KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
Easy Vault - Easy Vault: Hide Pictures, Videos, Gallery, Files is an all-in-one privacy protection application designed for those who want to lock and hide their private files.
AppLock (FOSS) - A privacy App lock FOSS application.
Folder Lock - Folder Lock is a security software that helps you to password protect files, shred files, clean history, encrypt the personal documents and much more.
Hexlock - Security app locker keeps apps private with smart profiles for any situation
Photo Lock App - Photo Lock App – Hide Pictures and Videos is one of the best privacy protection apps developed and published by Donna Danley.