<b>Apache webserver</b> is currently the most popular free [[open source]] [[web]] [[server]] [[software]] available. It runs on a wide variety of operating systems, including various free [[UNIX]] varients. Recently Apache received a substantial boost as [[Kylix]] and [[Delphi]] 6 development tools from [[Borland]] both support Apache (only Kylix can compile native Linux code)
According to [http://uptime.netcraft.com/up/graph what_is that_site_running] as of 1 September 2001, The site www.wikipedia.com is running Apache/1.3.19 (Unix) [[PHP]]/4.0.4pl1 mod_fastcgi/2.2.10 on [[Linux]].