digiKam - Professional Photo Management with the Power of Open Source
Kap - Kap is an open-source screen recorder built with web technology.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Flux - Application Architecture for Building User Interfaces
Photos on macOS - Photos keeps your images organized and accessible. Rediscover favorite shots with Memories. Access them on your devices with iCloud Photos.
KPhotoAlbum - KPhotoAlbum is a tool which you can use to easily sort your images.