Google Analytics is a free web analytics service that tracks and reports website traffic.
hCaptcha is an anti-bot solution that protects user privacy and rewards websites.
Modernizr is a JavaScript library that detects the features available in a user's browser.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.