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Sblam!

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

17 Alternatives To Sblam!

AbuseIPDB

AbuseIPDB is an IP address blacklist for webmasters and sysadmins to report IP addresses engaging in abusive behavior on their networks, or check the report history of any IP.

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…

ConvertKit

Email marketing software for online creators. We help you earn a living online through an intuitive email marketing automation tool.

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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Mollom

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

NoMoreCaptchas

What Does NoMoreCaptchas Do?

Purple WiFi

Oct 4, 2017 - Spectators that attended the Los Pumas vs All Blacks game on Saturday were able to enjoy high-speed connectivity and share memories of the game thanks to Efan, Cisco Meraki and Purple’s WiFi and analytics solution.

Securimage

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

SocialNourish

SocialNourish is a twitter management and marketing tool, used by thousands to increase twitter followers, SocialNourish let you manage multiple twitter accounts and help to clean the account and improve follower/following ratio.
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UniqPin

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

With this utility you can easily enrypt your html web forms and protect them against SPAM e-mails

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.
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reCAPTCHA

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