Owlead - Grow your Twitter with valuable followers, effortless
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.
TweetPilot - Grow a relevant & responsive following on Twitter
MTcaptcha - Enterprise Captcha solutions
MyFollowers - myfollowers.us is the answer to how to get more free followers on twitter. Start using www.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.