digiKam - Professional Photo Management with the Power of Open Source
Shotwell - Shotwell is an open source photo organizer designed for the GNOME desktop environment.
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.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Mylio - Photo organization and protection, using peer-to-peer to keep all your photos available an all your...