Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
XAMPP - XAMPP is a free and open-source cross-platform web server that is primarily used when locally developing web applications.
Forge - Static web hosting made simple
Phusion Passenger - Phusion Passenger is a multi-language (Ruby, Python, Node) web & app server which can integrate into Apache and Nginx
Eclipse Jetty - Jetty is a highly scalable modular servlet engine and http server that natively supports many modern protocols like SPDY and WebSockets.