smspasswd provides two factor authentication via cell phone short message service (SMS). It currently supports LDAP and RADIUS two factor authentication for users with cell (mobile) phones.
You can download it from the following link: https://packetstormsecurity.com/files/download/57510/smspasswd-0.1.tgz
Source: https://packetstormsecurity.com/files/57510/smspasswd-0.1.tgz.html