A family of Microsoft relational database management systems designed for ease of use.
This is something you have to develop yourself.
You can create very simple login forms that validate against a single db password (then again just encrypt the db if that is what you are after) or much more advanced role based login systems. Everything depends on your needs. Take a look at http://www.devhut.net/2012/12/21/ms-access-login-form/ where I posted links to several sample login databases. Check them out and use the one that suits your needs best.