Alternate Google ReCaptcha
 

I have developed my website using ASP.Net platform. In this i have used Google ReCaptcha for spam filtering of my contact us form. I need to change the captcha with other one. Any new captcha technology available? if so please let me know.

take a look at my captcha project. it's not ready yet but close ;)
http://photocaptcha.us

Thanks for your kindly information. Once you have done that let me know.