Uppy - The next open source file uploader for web browsers
Filestack - Simple file uploader and robust APIs for uploading, transforming, and delivering any file into your app. Filestack is a collection of tools and powerful APIs that make it simple to upload, transform, and deliver content.
CloudExplorer - Cloud Explorer is a open-source Amazon S3 client.
Uploader Window - Easy File Uploader for your websites and apps
Uploadcare - File uploading, media processing & content delivery for modern web apps
CDNify - Accelerate your apps and websites with the CDNify content delivery network. Superfast, simplified and affordable CDN for developers, startups and agencies.