Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
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.
Microsoft IIS - Internet Information Services is a web server for Microsoft Windows
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
MTcaptcha - Enterprise Captcha solutions