THC-HYDRA - Network login Bruteforcer
Hydra is best for Samba, FTP, POP3, IMAP, Telnet, HTTP Auth, LDAP, NNTP, MySQL, VNC, ICQ, Socks5, PCNFS, Cisco and more. Includes SSL support and is part of Nessus.

Download
http://www.thc.org/releases/hydra-7.2-src.tar.gz