UserEnginePro.NET is a simple, adjustable, well commented User Signup and Authentication system.
It contains user signup, login, forgotten password, and edit user account functionality and also an administrative area which allows queries such as users by country, date joined, opt-in choices, etc.
Email address verification is optionally available where a user is required to click on a verification link that is emailed to them before their account becomes active.
All data is stored in an MS Access 2000/XP or SQL Server 2000 database.
A new feature is the ability to permit Active Directory or local computer users to login without the need to signup for an account, perfect for corporate intranet use.
The application is written in ASP.NET (C#) and the full source code is supplied upon purchase, which is easily configured by following the comprehensive online help & setup guides.
Additional web pages on your website are easily secured by adding a one line include which checks to see if a user is logged in or not.
The system is also fully template driven so as to blend in with your existing style.