App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
Voice Changer - Voice Changer is the name of a neat and clean voice changing application that will make you able to alter the pitch and the speed of any audio file.
AppLock (FOSS) - A privacy App lock FOSS application.
VoiceFX - VoiceFX – Voice Changer with Voice Effects is a comprehensive voice changer and recorder app that lets you transform your voice and music with audio effects.
Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.
Voice Changer Audio Effects - Voice Changer Audio Effects is a free, easy to use, and beautiful voice changer app that offers great sound effects for fun.