Uppy - The next open source file uploader for web browsers
Filestack - Filestack is file uploading software designed for cloud usage applications.
Uploadcare - CDN, content delivery, content delivery network, file handling, image processing, cloud storage.
CarrierWave - Solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
Uppy.io - Next open source file uploader for web browsers
Cloudinary - Cloudinary is a cloud-based service for hosting videos and images designed specifically with the needs of web and mobile developers in mind.