Couchdrop is a cloud SCP server, which means files can be downloaded using the SCP tool packaged with openssh on virtually any unix derivative.
Before starting, you need a Couchdrop account and a linked cloud storage provider. This can be created by visiting https://my.couchdrop.io.
Downloading a file
Couchdrop allows you to download files that exist in your storage provider like Dropbox or files that have specifically been uploaded using Couchdrop.
For example, my Dropbox looks like:
To download the file testfile.txt via SCP I would use the following command:
scp firstname.lastname@example.org:/testfile.txt .
This command will download the file testfile.txt from Dropbox into the current directory.