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APR: Apache Portable Runtime.
Ant: Ant is a Java based build tool.
Apache httpd-1.3: Apache HTTP Server Version 1.3
Apache httpd-2: Apache HTTP Server Version 2
Apache httpd-test: Test framework and utilities for the Apache HTTP Server
BCEL - Now in Jira: See http://issues.apache.org/jira/browse/BCEL
The Byte Code Engineering Library is intended to give users a convenient possibility to analyze, create, and manipulate Java class files
Batik - Now in Jira: See https://issues.apache.org/jira/browse/BATIK
A Java based toolkit for generating, manipulating and viewing SVG (Scalable Vector Graphics) content. SVG is an XML grammar for 2D graphics.
Crimson: XML Parser originally from Sun.
Fop - Now in Jira: See https://issues.apache.org/jira/browse/FOP
Fop is an xsl:fo formatter. It is a Java application that reads a formatting object tree and then turns it into a PDF document.
JMeter: The Apache JMeter™ application is open source software, a 100% pure Java application designed to load test functional behavior and measure performance. It was originally designed for testing Web Applications but has since expanded to other test functions.
Lenya: Lenya was a Content Management System based on XML and XSLT. One of its core components is Apache Cocoon. Lenya is now a retired project - see attic.apache.org for more info.
Log4j - Now in Jira: See https://issues.apache.org/jira/browse/LOG4J2 A reliable, fast and extensible logging library for Java.
ORO: Set of text-processing Java classes that provide Perl5 compatible regular expressions, AWK-like regular expressions, glob expressions, and utility classes for performing substitutions, splits, filtering filenames, etc.
POI: The POI project consists of complete ports of popular productivity office suite file formats.
Regexp: 100% Pure Java Regular Expression package.
Ripple: Ripple is going to be (in some circles already is) the goto emulator for rapid development of mobile web applications. This will be accomplished by quickly keeping up with the mobile web platforms as they arise (Cordova, Tizen, WAC, WebWorks, etc).
Rivet: Apache Rivet is a system for creating dynamic web content via the Tcl programming language integrated with the Apache Web Server.
Security - Now in JIRA: Santuario (previously XML Security Project)
Slide: WebDAV aware content management system
Taglibs: A collection of JavaServer Pages (JSP) custom tag libraries useful in building web applications
Test: For testing only, goes nowhere...
Tomcat 3: A Servlet container implementing the Servlet Specification v2.2 and the Java Server Pages (JSP) Specification v1.1.
Tomcat 4: A Servlet container implementing the Servlet Specification v2.3 and the Java Server Pages (JSP) Specification v1.2.
Tomcat 5: A Servlet container implementing the Servlet Specification v2.4 and the Java Server Pages (JSP) Specification v2.0.
Tomcat 6: A Servlet container implementing the Servlet Specification v2.5 and the JavaServer Pages (JSP) Specification v2.1.
Tomcat 7: A Servlet container implementing the Servlet Specification v3.0 and the JavaServer Pages (JSP) Specification v2.2.
Tomcat 8: A Servlet container implementing the Servlet Specification v3.1, the JavaServer Pages (JSP) Specification v2.3, the Expression Language (EL) Specification v3.0, the WebSocket specification v1.1, and the Java Authentication Service Provider Interface for Containers (JASPIC) Specification v1.1.
Tomcat 9: A Servlet container implementing the Servlet Specification v4.0, the JavaServer Pages (JSP) Specification v2.3, the Expression Language (EL) Specification v3.0, the WebSocket Specification v1.1, and the Java Authentication Service Provider Interface for Containers (JASPIC) Specification v1.1.
Tomcat Connectors: Provides integration between Apache Tomcat and a range of web servers
Tomcat Modules: Additional modules for Apache Tomcat. Modules may be for a specific Tomcat version or may work with several. See each module's documentation for details.
Tomcat Native: Provides an APR based native HTTP and AJP connectors for Tomcat
Watchdog: Compatibility tests that check a servlet/JSP container implementation of the corresponding specifications
WebSH: webshell is a rapid development environment for building powerful, fast, and reliable web applications. webshell is versatile and handles everything from HTML generation to data-base driven one-to-one page customization. Websh is based on Tcl.
XMLGraphicsCommons - Now in Jira: See https://issues.apache.org/jira/browse/XGC
Apache XML Graphics Commons is a library that consists of several reusable components used by Apache Batik and Apache FOP. Many of these components can easily be used separately outside the domains of SVG and XSL-FO. You will find components such as a PDF library, an RTF library, Graphics2D implementations that let you generate PDF & PostScript files, a simple XMP metadata framework and much more.
XalanJ1: Unsupported previous version of XalanJ, now replaced by XalanJ2. Bugzilla for XalanJ1 is only provided for existing users to share information; we do not plan to address issues in XalanJ1.
Xerces-J: Xerces Java 1. The Java version of the ASF XML Parser.
Xindice: Native XML database
XmlCommons - Now in JIRA: xml-commons module - common interfaces for XML processing, used by Xalan, Xerces, Crimson...