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.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
MTcaptcha - Enterprise Captcha solutions
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.