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.
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.
Flatfile - The new standard for data import
Uploadcare - File uploading, media processing & content delivery for modern web apps
restdb.io - restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.