Uppy - The next open source file uploader for web browsers
Uppy.io - 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.
PigeonFiles - The #1 Google Drive uploader app for allowing others to upload files to your Google Drive. Create your first secure upload page for FREE in 30 seconds.
Uploadcare - File uploading, media processing & content delivery for modern web apps
Bashupload - Upload files from command line to share between servers