Confident CAPTCHA™ is a clickable, picture CAPTCHA that stops spam and malicious bots, while remaining a very easy CAPTCHA for humans to solve.

Adds Google’s No CAPTCHA reCAPTCHA to bbPress forms.

Implement and have full control over a captcha field for your Gravity Forms

This is a simple plugin that adds a recaptcha validation to the bbPress 2.0 topic creation and topic reply forum.

Stop spam bots from registering, logging in, filling out contact forms and commenting on your site without using annoying Captcha codes or puzzles.

ALTCHA offers a free, open-source Captcha alternative, ensuring robust spam protection while respecting user privacy and GDPR compliance.

minotaur - Rid the internet of text CAPTCHAs!

Simple question that blocks most spambots (and paid robots) by making them answer a common sense question