Email Hosting Providers

SPFSPF

SPF Usage Statistics · Download List of All Websites using SPF

The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery.

Web Servers

ApacheApache

Apache Usage Statistics · Download List of All Websites using Apache

Apache has been the most popular web server on the Internet since April 1996.

Apache Tomcat CoyoteApache Tomcat Coyote

Apache Tomcat Coyote Usage Statistics · Download List of All Websites using Apache Tomcat Coyote

Coyote HTTP/1.1 Connector element represents a Connector component that supports the HTTP/1.1 protocol. It enables Catalina to function as a stand-alone web server, in addition to its ability to execute servlets and JSP pages.

Operating Systems and Servers

Apache Tomcat JKApache Tomcat JK

Apache Tomcat JK Usage Statistics · Download List of All Websites using Apache Tomcat JK

Apache Tomcat is an open source software implementation of the Java Servlet and JavaServer Pages technologies.

OpenSSLOpenSSL

OpenSSL Usage Statistics · Download List of All Websites using OpenSSL

The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

UnixUnix

Unix Usage Statistics · Download List of All Websites using Unix

A *nix based operating system (undisclosed).