The goal of the Jakarta Project is to provide commercial-quality server solutions based on the Java Platform that are developed in an open and cooperative fashion.
SubProjects : Alexandria, Ant, Avalon, BCEL, Cactus, Commons, ECS, James, Jetspeed, JMeter, Log4J, Lucene, ORO, Regexp, Slide, Struts, Taglibs, Tomcat, Turbine, Velocity, Watchdog.

The official site of Maven.

The official site of ANT.

This project has been merged with the Jakarta Project.

The goals of the Apache XML Project are:

• to provide commercial-quality standards-based XML solutions that are developed in an open and cooperative fashion,
• to provide feedback to standards bodies (such as IETF and W3C) from an implementation perspective, and
• to be a focus for XML-related activities within Apache projects

The Apache XML Projects :

• Xerces : XML parsers in Java, C++ (with Perl and COM bindings)
• Xalan : XSLT stylesheet processors, in Java and C++
• Cocoon : XML-based web publishing, in Java
• AxKit : XML-based web publishing, in mod_perl
• FOP : XSL formatting objects, in Java
• Xang : Rapid development of dynamic server pages, in JavaScript
• SOAP : Simple Object Access Protocol
• Batik : A Java based toolkit for Scalable Vector Graphics (SVG)
• Crimson : A Java XML parser derived from the Sun Project X Parser.

Apache has been the most popular web server on the Internet since April of 1996. The March 2002 Netcraft Web Server Survey found that 54% of the web sites on the Internet are using Apache, thus making it more widely used than all other web servers combined.
The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for various modern desktop and server operating systems, such as UNIX and Windows NT. The goal of this project is to provide a secure, efficient and extensible server which provides HTTP services in sync with the current HTTP standards.