FTP manager embedded in a webpage?

I’m looking for an ftp-type manager that I can stick in a webpage that would do the following:I’m trying to create a “client” section where clients can log in and upload or download files that are in a directory that has been set up for them. This ftp server DOES NOT NEED TO BE the server that hosts the website. In fact, it probably won’t be. So really it’s just a portal that allows people to ftp to our server. This doesn’t really need to be a wordpress plugin, but could be. It could be some non-wordpress script that I can stick in a theme file. Thoughts?