Brutus is a small threaded python FTP brute-force and dictionary attack tool. It supports several brute-force parameters such as a custom character sets, password length, minimum password length, prefix, and postfix strings to passwords generated.
You can download it from the following link: https://packetstormsecurity.com/files/download/144035/brutus-0.3.py.txt
Source: https://packetstormsecurity.com/files/144035/Brutus-FTP-Attack-Tool-0.3.html