Nginx
Nginx (pronounced "engine x"[8] /ˌɛndʒɪnˈɛks/ EN-jin-EKS) is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. The software was created by Igor Sysoev and publicly released in 2004. Nginx is free and open-source software, released under the terms of the 2-clause BSD license. A large fraction of web servers use Nginx, often as a load balancer.