CodeCanyon - SimpleAuth : Very Simple Secure Login System v4.1 | 751 KB
SimpleAuth is a simple and secure multi-user PHP login system. No database required. No php knowledge needed to implement this login system.
You can secure all kind of pages : customer area, administration interface, member page or any private page.
DEMO:
http://codecanyon.net/item/simpleauth-very-simple-secure-login-system/232148