nginx

Basic HTTP server features
Other HTTP server features
Mail proxy server features
TCP proxy server features
Architecture and scalability
Tested OS and platforms

nginx [engine x] is an HTTP and reverse proxy server, a mail proxy server, and a generic TCP proxy server, originally written by Igor Sysoev. For a long time, it has been running on many heavily loaded Russian sites including Yandex, Mail.Ru, VK, and Rambler. According to Netcraft, nginx served or proxied 22.27% busiest sites in July 2015. Here are some of the success stories: Netflix, Wordpress.com, FastMail.FM.

The sources and documentation are distributed under the 2-clause BSD-like license.

Commercial support is available from Nginx, Inc.

Basic HTTP server features

Other HTTP server features

Mail proxy server features

TCP proxy server features

Architecture and scalability

Tested OS and platforms