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.
SubmitCore - SubmitCore offers web design and internet marketing services.
MTcaptcha - Enterprise Captcha solutions
SynapseInteractive - SynapseInteractive offers an array of services and solutions aimed at promoting businesses.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
DigitalSeed - DigitalSeed offers SEO and digital marketing services.