Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
mini_httpd - mini_httpd is a small HTTP server for low or medium traffic sites.
nginx - A high performance free open source web server powering busiest sites on the Internet.
thttpd - thttpd is a simple, small, portable, fast, and secure HTTP server.
HTTP - is an application protocol for distributed, collaborative, and hypermedia information systems.
Droopy - Droopy is a mini Web server whose sole purpose is to let others upload files to your computer.