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Try this google "site:sourceforge.net ftp library"

After reading three pages of hits the only one that surfaced is alexis ftp (aftp). Try the same and see what you get that you can use.

The only other decent api library is here: NcFTP Software (http://www.ncftp.com/)
It provides a lot of functionalilty, but it is not free. I do not know if multi-interface is there or not, it was...