App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
Smart Pix Manager - Smart Pix Manager is a powerful and reliable solution for the management and viewing of all documents, common images, sound (WMA, MP3), and video files (AVI, MPEG), etc.
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.
Hexlock - Security app locker keeps apps private with smart profiles for any situation
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!