App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
Viso - Beautiful minimal image viewer for MacOS
AppLock (FOSS) - A privacy App lock FOSS application.
LightGallery - A modern, electron and nodejs based image viewer for Mac, Windows and Linux.
Hexlock - Security app locker keeps apps private with smart profiles for any situation
digiKam - Professional Photo Management with the Power of Open Source