List of disposable email domains. You can use it to block fake users on your newsletter.

Symfony Form Spam Protection

🛡️ Protect websites from spam and other attacks

Antispam extension for MediaWiki.

Module for any CMS

IPS Community Suite 4.0 (IP.Board) anti-spam extension.

Xenforo2 Anti-Spam

1C Bitrix anti-spam mod.

Google recaptcha for powermail 3

XenForo anti-spam addon.

Anit-spam extension for Yii2 framework.

MyBB Anti-Spam plugin

Anti-spam hook for vBulletin 3.X.

Anti-Spam extension to protect Magento against spam bots.

Anti-spam plugin for Joomla 2.x

Anti-spam plugin for Joomla 1.5.

A simple spam protection for Laravel 5.4 and up.