(pronounced "A patchy Httpd", according to the JargonFile)
A famous OpenSource WebServer that usually runs as a daemon process on Unix systems. As the main Web protocol is HTTP, the daemon is called httpd. Apache and its derivatives account for over 60% of public Web servers, according to http://www.netcraft.com/survey.
Apache is released under the AsfLicense?.
Apache is used by the WebSphere ApplicationServer suite from InternationalBusinessMachines.
Tutorials selected by the ASF can be found at http://httpd.apache.org/docs/misc/tutorials.html