This plugin allows you to implement Google Captcha (reCAPTCHA) into web forms.
PlusCaptcha - The Easiest Captcha to Setup and Execute, with Auto-Setup Feature! Trusted by thousands of blog, e-commerce, and government sites!
Stop spam bots from registering, logging in, filling out contact forms and commenting on your site without using annoying Captcha codes, puzzles or fa
The Add new recaptcha google plugin allows you to implement a super security REcaptcha form into web forms.
Add Google’s simple checkbox reCAPTCHA to WordPress wp-admin login page.