New Google Photos - Shared suggestions, libraries and photo books
digiKam - Professional Photo Management with the Power of Open Source
Viso - Beautiful minimal image viewer for MacOS
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
Photos on macOS - Photos keeps your images organized and accessible. Rediscover favorite shots with Memories. Access them on your devices with iCloud Photos.