Minio - Minio is an open-source minimal cloud storage server.
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
Google Cloud Storage - Google Cloud Storage offers developers and IT organizations durable and highly available object storage.
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
Azure Blob Storage - Use Azure Blob Storage to store all kinds of files. Azure hot, cool, and archive storage is reliable cloud object storage for unstructured data
Sirv - Dynamic image processing, hosting and rich-media for retailers and eCommerce.