Anti-spam Alternatives

StopForumSpam - a database of known forum and blog spam, its sources and the email addresses reported

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

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

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

Spam protection for WordPress, Joomla, Drupal, and any other websites

The better, new standard to stop spam content.

freemium $49.0 / Monthly (Unlimited Websites, 100K API Calls)

Grow your Twitter with valuable followers, effortless

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

freemium $99.0 / Annually

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

Allows you easily scan for and delete scam comments using several methods. - GitHub - ThioJoe/YT-Spammer-Purge: Allows you easily scan for and delete scam comments using several methods.

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

A lightweight (~217 bytes vanila JS at frontend) and privacy-friendly plugin to prevent spam comment in the default commenting system of WordPress. Works instantly. No settings required. No captcha.

Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture...