A powerful, provider-based .NET CAPTCHA control with audio challenge and Microsoft Visual Studio design-time support.
The original source code at coreproject (Captcha) compiles and works great on ASP.NET 4.0 but this binary module yields a "ctor" runtime error.
Do not waste your time with it! No sample code. No screenshots. It do not work. No VS sample project. I used it earlier, but for now it not good idea.