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.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Invision - Prototyping and collaboration for design teams
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.
Sketch - Professional digital design for Mac.