Advanced Security is user registration/login system written in pure PHP. It is designed to provide very high security level of any part of you system. It can be used with existing look based on twitter bootstrap or it easily can be inserted into any existing PHP application and integrated with existing system.
Demo: http://codecanyon.net/item/advanced-security-php-registerlogin-system/5282621
Demo: http://codecanyon.net/item/advanced-security-php-registerlogin-system/5282621
