Module for CMS Made Simple, http://dev.cmsmadesimple.org/projects/securelogin
Module secures login process with ip-whitelist. When user is logging in module will check if his/hers ip is in the whitelist. If not, user will get an email with link, which adds user's ip in the list after click. Helps especially if user lost his credentials, attacker will not be able to login because of ip check.
Published under GPLv3.