Phiewer - Image Viewer - Phiewer is the easiest and fastest way to view your images, videos and even audio files.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
ImageGlass - You can use Image to view your digital images and photos of many different formats.
Invision - Prototyping and collaboration for design teams
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Sketch - Professional digital design for Mac.