What are some alternatives?
When comparing tus.io and Uppy, you can also consider the following products
Filestack - Filestack is file uploading software designed for cloud usage applications.
Uppload - File uploading widget with 20+ plugins, no backend required
Uppy.io - Next open source file uploader for web browsers
CarrierWave - Solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
Uploadcare - CDN, content delivery, content delivery network, file handling, image processing, cloud storage.