XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
JetPhoto Studio - JetPhoto Studio is a sleek and easy-to-use digital photo software that allows users to manage their photos in an attractive, intuitive mode and turning a sometimes frustrating chore into a fun and easy way by clicking only several steps.
AppLock (FOSS) - A privacy App lock FOSS application.
StudioLine Photo Basic 4 - StudioLine Photo Basic 4 is a sophisticated image development tool that allows photo editing and multiple presentation options for personal usage.
Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.