digiKam - Professional Photo Management with the Power of Open Source
Icons8 Background Remover - Quickly remove the background from any photo
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
IMG.LY - Power Your Apps with IMG.LY | The Leading Provider of Design, Photo, and Video Editing SDKs
Photos on macOS - Photos keeps your images organized and accessible. Rediscover favorite shots with Memories. Access them on your devices with iCloud Photos.
ClippingMagic.com - Remove image backgrounds online. Make backgrounds transparent, white, etc. Edit, crop, rotate, fix colors, add shadows, all you need for great photos!