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.
Twilio - Brings voice and messaging to your web and mobile applications.
MTcaptcha - Enterprise Captcha solutions
Plivo - Plivo simplifies your customer engagement.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.