EdtFTPj
edtFTPj is an open-source FTP client library for use in Java applications licensed under the LGPL. It was first released in 2000, and was originally known as the Java FTP Client Library. It is supplied as a JAR file and can be used in any Java application that requires FTP functionality. edtFTPj provides FTP capabilities for popular software packages such as Jalbum and Cyberduck. edtFTPj is also known as edtFTPj/Free. There is also a commercial version known as edtFTPj/PRO, which includes the following additional features: FTPS (explicit and implicit modes), SFTP and SCP (secure copy), multiple protocols supported in the one component, simultaneous transfers by use of FTP connection pools, directory transfers and directory synchronization. See also

 Comparison of FTP client software

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Free FTP clients