Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
Flickr - image and video hosting website
Amazon CloudFront - Amazon CloudFront is a content delivery web service.
Photobucket - Photobucket offers image hosting and free photo and video sharing.
KeyCDN - KeyCDN is a high-performance Content Delivery Network (CDN). Lowest price globally at $0.04/GB with HTTP/2 Support and free Origin Shield.