What are some alternatives?
Cloudinary - Cloudinary is a cloud-based service for hosting videos and images designed specifically with the needs of web and mobile developers in mind.
Filestack - Filestack is file uploading software designed for cloud usage applications.
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
CleanPix - CleanPix is a digital media management software solution.
Imagify - Optimize and resize images online and through your CMS.
Cyberduck - A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.