Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
mini_httpd - mini_httpd is a small HTTP server for low or medium traffic sites.
Microsoft IIS - Internet Information Services is a web server for Microsoft Windows
thttpd - thttpd is a simple, small, portable, fast, and secure HTTP server.
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
HTTP - is an application protocol for distributed, collaborative, and hypermedia information systems.