Simple captcha generator
See the Pen by AlexisBertin (@AlexisBertin) on CodePen.
Minimal Math Captcha Plugin For jQuery - Captcha Basic
Stopping Comment Spam In Your Webpage - jQuery noSpamQuiz.js
Anti-Bot Icon Captcha Plugin With jQuery And PHP - IconCaptcha
Touch-friendly Image Puzzle Captcha Plugin - jQuery SliderCaptcha
Toggle Login/Register Form
CSS only: Google Captcha
noCaptcha
Captcha
reCAPTCHA Responsive Scaling
Validate Google reCAPTCHA
CAPTCHA (1) Kathy Pine
CAPTCHA
Captcha Code Generatore "JS"
CSS Bot Confusion
bootstrap captcha
HTML-only captcha
Javascript Captcha As Image
Simple captcha
Giphy Captcha
Captcha Colors experiment
Custom Pure Javascript CAPTCHA
JQCap - jQuery Captcha Widget
Fake Captcha
Contact form with filter validation and captcha code