Flickr - image and video hosting website
Img.vision - Image hosting & video hosting for eCommerce sellers
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
BeeIMG - BeeIMG is a simple, fast, easy image sharing solution created to fill up your image sharing needs.
ImageShack - Unlimited space to host images, easy to use image uploader, albums, photo hosting, sharing, dynamic image resizing on web and mobile.
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.