reCAPTCHA is a free security service that protects your websites from spam and abuse.
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Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.
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What Does NoMoreCaptchas Do?
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Securimage is a script for generating complex images and CAPTCHA codes to protect forms from spam...
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The best captcha alternative. Accessible, Mobile-friendly, and Retina-ready! Available for Node.js, PHP, Ruby, Meteor, jQuery, Angular, and vanilla JS.
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UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect...
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Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture...
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FeedCaptcha is a new captcha system, easy to integrate and with meaning for your product.
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Open source reCAPTCHA alternative
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Easy to use - Nothing stupid your visitors have to type before the form submits.
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Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your...
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Spam protection plugins for Joomla, WordPress, phpBB3, IP.Board, vBulletin and etc.