Captcha Mvc - is a library written in C#, that you can use in your MVC project.
The project page on the codeplex.
Source code is available on the link.
Features:
- You can easily change or extend the current implementation of the captcha.
- There's two types of captcha plain and mathematical.
- Supports for storing captcha in the session or cookie, but you can easily add your implementation.
- Supports MVC 3-4.
- Supports the "intelligent captcha".