This page contains information about three of the most popular web servers on the web.
Apache HTTP Server
Apache HTTP Server (also referred to as simply "Apache") has, at the time of writing, been the most popular web server on the web since 1996. Apache is developed and maintained by the Apache Software Foundation, which consists of a decentralized team of developers. The software is produced under the Apache licence, which makes it free and open source.
Apache is available for a range of operating systems, including Unix, Linux, Novell Netware, Windows, Mac OS X, Solaris, and FreeBSD.
Apache HTTP Server website: http://httpd.apache.org
Microsoft Internet Information Services (IIS)
IIS is, at the time of writing, the second most popular web server on the web. It is however, gaining market share, and if the current trend continues, it won't be long before it overtakes Apache.
IIS comes as an optional component of most Windows operating systems. You can install IIS by using Add/Remove Windows Components from Add or Remove Programs in the Control Panel.
Microsoft IIS website: http://www.microsoft.com/iis
Sun Java System Web Server
Based on the Sun One Web Server, the Sun Java System Web Server is designed for medium to large business applications. Sun Java System Web Server is available for most operating systems.
Sun Java System Web Server website: http://www.sun.com/software/products/web_srvr/home_web_srvr.xml