hCaptcha - Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
AbTest.io - A free url shortener with A/B testing features
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
Marpipe - Automate Your Ad Testing, Optimize Your Creative