Yafc is an OpenSource console mode FTP client. It has support for Kerberos 4/5 authentication and sftp (ssh2). Other features include tab completion, directory cache, powerful aliases, recursive file commands and bookmarks with autologin.
KioobFTP is a fully functionnal class to access FTP servers with PHP. The class have powerfull fonctions like dir cache, anti idle, recursive download, auto transfer mode, ascii conversions, etc
Frox is a transparent ftp proxy for linux, *BSD, and other UNIX like systems. It optionally supports
non-transparent proxying, caching, rewriting of ftp requests as http, transparent virus scanning, and conversion from active<-->passive mode ftp.