hydra

Network login brute-forcer (authorized testing only).

$ hydra -l admin -P passwords.txt ssh://10.0.0.5
$ hydra -L users.txt -P pw.txt ftp://target
$ hydra -l admin -P pw.txt 10.0.0.5 http-post-form \
  "/login:user=^USER^&pass=^PASS^:F=invalid"
$ hydra -t 4 -f -l admin -P pw.txt rdp://target