Flameshot - Powerful yet simple to use screenshot software for Linux.
Flickr - image and video hosting website
maim - maim (Make IMage) is a spiritual successor to scrot — a simplistic CLI-friendly screenshot tool.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
HotShots - Hotshots is a screenshot tool with some editing features.
PhotoPrism.app - PhotoPrism® is an AI-Powered Photos App for the Decentralized Web. It makes use of the latest technologies to tag and find pictures automatically without getting in your way. You can run it at home, on a private server, or in the cloud.