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Apache.org has 83 URLs listed in 76 Dmoz categories.

Apache HTTP Server Vulnerability Lists
Lists of security problems fixed in released versions of the Apache HTTP Server.
http://httpd.apache.org/security_report.html
Top/Computers/Security/Advisories_and_Patches

Apache: Cross Site Scripting Info
How the attack affects websites hosted on the Apache webserver and Apache specific issues.
http://httpd.apache.org/info/css-security/
Top/Computers/Security/Internet/WWW/Cross_Site_Scripting

Gump
Open Source - A continuous integration tool from the Apache project that is written in python and fully supports Apache Ant, Apache Maven and other build tools. Gump builds and compiles software against the latest development versions of those projects.
http://gump.apache.org/
Top/Computers/Software/Build_Management/Build_Manager_Tools

Maven
Open Source - Apache build manager for Java projects. Features a (POM) Project Object Model, extensible process plugin framework. Functions include build, deployment, and release management, project reporting, and web documentation generation.
http://maven.apache.org
Top/Computers/Software/Build_Management/Build_Manager_Tools

Continuum
Open Source - Continuum is a continuous integration server for building Java projects. It supports Maven 1.x/2.x, Ant, and Shell scripts.
http://continuum.apache.org/
Top/Computers/Software/Build_Management/Build_Manager_Tools

Ant
Pure Java build tool, simpler and easier to use than GNU Make. Also it runs many tasks including the javac compiler inside the same VM, so it can compile a large directory tree in seconds. [Open Source, BSD-like]
http://ant.apache.org/
Top/Computers/Software/Build_Management/Make_Tools/Ant

Xindice
DBMS written in Java to optimize the storage, retrieval, querying, and management of XML-based documents. Xindice was known as "dbXML Core" prior to joining the Apache XML Project.
http://xml.apache.org/xindice/
Top/Computers/Software/Databases/XML/Open_Source

Apache Jackrabbit
Open-source content repository for Java. Project details, documentation, download, and developer information.
http://jackrabbit.apache.org/
Top/Computers/Software/Document_Management/Products

Apache module mod_mime
This module is used to determine various bits of "meta information" about documents. This information relates to the content of the document and is returned to the browser or used in content-negotiation within the server. In addition, a "h
http://www.apache.org/docs/mod/mod_mime.html#addcharset
Top/Computers/Software/Globalization/Internet/Servers/WWW/Apache

JetSpeed [from Apache's Jakarta]
A servlet implementation of an open protocol GroupWare product. Backend (search engines, news, weather, POP3/IMAP/LDAP/NNTP, database) is based on other open source packages.
http://portals.apache.org/jetspeed-1/
Top/Computers/Software/Groupware/Open_Source