Phusion Passenger - Phusion Passenger is a multi-language (Ruby, Python, Node) web & app server which can integrate into Apache and Nginx
Forge - Static web hosting made simple
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
GCDWebServer - GCDWebServer is a modern and lightweight GCD based HTTP 1.1 server designed to be embedded in OS X & iOS apps.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
XAMPP - XAMPP is a free and open-source cross-platform web server that is primarily used when locally developing web applications.