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.

CleverTap - CleverTap offers blazing fast analytics, powerful real-time segmentation, multi-channel messaging, A/B testing and personalization in one unified solution.

reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.

Apple App Analytics - Apple's very own iTunes Connect App Analytics

GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.

Callcounter.eu - Callcounter gathers API usage data and gives you insight in trends, slow parts and errors.