FTP proxy server

[Malcolm Kay]

My company uses Squid as an HTTP proxy server under FreeBSD, 
serving Windows, FreeBSD, and Linux clients -- Squid is quite 
high profile and therefore seemed to be a reasonable choice.

For FTP proxy server there are a number available in the ports
but I don't see anything that stands out. I tend to favour 
ftpproxy for the straightforward name or frox for the weird name 
and claimed similarity (and perhaps cooperation) with Squid.

The FTP clients that matter will be on FreeBSD or Linux boxes.

Does any one have some recommendations wrt either of these --
or some other FTP proxy server software.

Any thoughts please,

Malcolm