Ubuntu/Web Servers

Quote from https://help.ubuntu.com/12.04/serverguide/web-servers.html

A Web server is a software responsible for accepting HTTP requests from clients, which are known as Web browsers, and serving them HTTP responses along with optional data contents, which usually are Web pages such as HTML documents and linked objects (images, etc.).

HTTPD - Apache2 Web Server

PHP5 - Scripting Language

Squid - Proxy Server

Ruby on Rails

Apache Tomcat