Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Flickr - image and video hosting website
Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
ksnip - Ksnip is a Qt based cross-platform screenshot tool that provides many annotation features for your screenshots. - DamirPorobic/ksnip
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.