Flatfile - The new standard for data import
Uppy - The next open source file uploader for web browsers
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Uploadcare - File uploading, media processing & content delivery for modern web apps
Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly
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.