captcha.org

• https://captcha.org/
• http://captcha.com/php-captcha.html
• http://captcha.com/demos/features/captcha-demo.aspx
• http://captcha.com/
• http://captcha.com/asp.net-captcha.html
• http://captcha.com/asp-captcha.html
• http://captcha.com/java-captcha.html
• http://www.tipstricks.org/
• http://www.tipstricks.org/example.asp
• http://www.motobit.com/util/captcha
• http://www.motobit.com/
• http://www.codeproject.com/aspnet/captchaimage.asp
• http://www.brainjar.com/
• http://www.codeproject.com/aspnet/CaptchaControl.asp
• http://www.codinghorror.com/
• http://www.floresense.com/controls/dN/captcha/index.php
• http://www.floresense.com/
• http://cheated.by.safabyte.net/
• http://www.textdisguise.com/
• http://www.textdisguise.com/TextDisguise/Demo.aspx
• http://www.27seconds.com/
• http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=9204&lngWId=4
• http://csshyamsundar.wordpress.com/
• http://www.u229.no/stuff/Captcha
• http://www.u229.no/
• http://www.webwizcaptcha.com/
• http://www.webwizguide.com/webwizcaptcha/demo
• http://www.captcha.cc/
• http://www.documentroot.com/
• http://captchas.net/
• http://holderied.de/
• http://seppi.de/index.html.en
• http://www.recaptcha.com/
• https://recaptcha.sucks/
• http://recaptcha.net/learnmore.html
• http://www.cmu.edu/
• http://www.spamerator.com/
• http://www.brains-n-brawn.com/aicaptcha
• http://www.brains-n-brawn.com/
• http://www.captchakiller.com/
• http://sam.zoy.org/pwntcha
• http://sam.zoy.org/
• http://akismet.com/
• http://automattic.com/
• http://defensio.com/
• http://karabunga.com/