digiKam - Professional Photo Management with the Power of Open Source
Movavi Photo Manager - Focus on the memories, forget about managing photos
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Photos on macOS - Photos keeps your images organized and accessible. Rediscover favorite shots with Memories. Access them on your devices with iCloud Photos.
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.
IrfanView - IrfanView ... one of the most popular viewers worldwide.