Sketch - Professional digital design for Mac.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Flickr - image and video hosting website
Affinity Designer - Professional creative software, exclusively for Mac.
Photobucket - Photobucket offers image hosting and free photo and video sharing.