Shotwell - Shotwell is an open source photo organizer designed for the GNOME desktop environment.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Adobe Photoshop Lightroom CC - Adobe Photoshop Lightroom CC is a commercial photo processor and image organizer.
ImageGlass - You can use Image to view your digital images and photos of many different formats.
digiKam - Professional Photo Management with the Power of Open Source
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.