IconCaptcha (nuget): IconCaptcha is a faster and more user-friendly captcha than most other captchas. You no longer have to read any annoying text-images, with IconCaptcha you only have to compare two images and select the image which is only present once.  Implementation instructions can be found at https://github.com/fabianwennink/IconCaptcha-Plugin-ASP.NET
Keywords: iconcaptcha|icon-captcha|captcha|captcha-generator|jquery-captcha|csharp-captcha|captcha-alternative|anti-bot|iconcaptcha-plugin|asp-net|bots|captcha-image|jquery-plugin|security|user-friendly