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Mollom

Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your…

16 Alternatives To Mollom

Akismet

Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.
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Antispam Bee

Say Goodbye to comment spam on your WordPress blog or website.
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Cerber Security

Defends WordPress against hacker attacks, spam, trojans and malware.
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Confident Captcha

Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture…
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FeedCaptcha

FeedCaptcha is a new captcha system, easy to integrate and with meaning for your product.

GeeTest CAPTCHA

GeeTest protects your websites, mobile Apps and APIs from bot threats.
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MTcaptcha

Enterprise Captcha solutions
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Negative Captcha

A plugin to make the process of creating a negative captcha in Rails much less painful

NoMoreCaptchas

What Does NoMoreCaptchas Do?

PHPMailer

Email sending library for PHP.
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Sblam!

Open-source implementation of server-side spam filtering of blog comments and forum posts.

Securimage

Securimage is a script for generating complex images and CAPTCHA codes to protect forms from spam…
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UniqPin

UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect…

hCaptcha

Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.

phpformmailer

Easy to use - Nothing stupid your visitors have to type before the form submits.
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reCAPTCHA

reCAPTCHA is a free security service that protects your websites from spam and abuse.