Comment by nickcw

There is of course rclone: https://rclone.org/commands/rclone_serve_http/

    rclone serve http .

You can replace . with any of your other cloud storage backends too (s3, google drive, dropbox, etc), or http with sftp, webdav, ftp, dlna. It works on Windos/macOS/Linux.

(Rclone author ;-)