Javapedia
- A wiki-style reference for the Java programming language and other related technologies.
- http://www.javapedia.net/

Java Touch
- Provides resources related to Java technology, EJB, Spring, Hibernate, Ajax, and XML.
- http://javatouch.googlepages.com/

Java Channel
- Collaborative database of reviews about resources.
- http://www.java-channel.org/

Microsoft Technologies for Java
- News and technical information.
- http://www.microsoft.com/mscorp/java/

Java on HP-UX
- Technical information including news, tips, and downloads.
- http://hp.com/go/java

Borland Java Community
- JBuilder's developer community with FAQs, documentation, and patches.
- http://dn.codegear.com/java/

JMatrix.net
- A developer portal, featuring a variety of projects, forums, a knowledgebase, and news feeds.
- http://jmatrix.net/

IBM Java developerWorks
- Tutorials, regular articles on best coding practice, news, and free software.
- http://www-128.ibm.com/developerworks/java/

JADCentral
- PointBase portal with news, forums, code, and downloads.
- http://www.jadcentral.com/

Planet JDK
- Blog aggregator for JDK community members.
- http://planetjdk.org/

WinHelp Java Documentation
- API documentation in WinHelp and HTMLHelp format.
- http://www.allimant.org/javadoc/

Java programming resources
- Hints and resources for beginners and advanced programmers.
- http://schmidt.devlib.org/java/

JSourcery
- Provide Java documentation (Javadocs) and hyperlinked source code for many open source projects.
- http://jsourcery.com

Java Spec Report
- Unofficial errata for the language and virtual machine specifications.
- http://www.dynamicaspects.com/java-spec-report/

java.blogs
- Group aggregation for Java-related weblogs.
- http://javablogs.com/

JavaReference.com
- A resource site for the Java Community. Articles, examples, books and book reviews, forum, test center for Java certification, downloads, news.
- http://www.javareference.com/

JDocs.com
- Collection of online javadocs for many popular packages. Includes search and user contributed notes.
- http://www.jdocs.com

programmingsite - Java section
- A collection of resources for the Java programming language.
- http://www.programmingsite.co.uk/modules.php?op=modload&name=Web_Links&file=index&req=viewlink&cid=1

Light Development
- Open source applications and components for Java developers. SimplyHTML related tools. SocketTalk is a library of Java[tm] classes to simplify peer to peer communication through sockets. Resources.
- http://www.lightdev.com/

ACME Java
- Applets, applications, utility classes. ACME Java FAQ. Some bugs and deficiencies founded in JDK. Resources.
- http://www.acme.com/java/

Perry Smith Enterprises Java Q & A
- Includes message boards, chat rooms, coding examples, and job opportunities.
- http://www.perryland.com/Java1.shtml

Java Community Process Program
- Information on latest JSR status.
- http://www.jcp.org/en/home/index

The Artima Developer Community
- Collection of resources about Java, Jini, the JVM, and object oriented design. Includes articles, books, tutorials, FAQs, discussion forums, applets, source code, and seminars.
- http://www.artima.com/

Java Performance Tuning
- Tips, resources, and monthly newsletter on improving the performance of applications.
- http://www.javaperformancetuning.com/

The Java Memory Model
- Bill Pugh's collection of resources and a mailing list.
- http://www.cs.umd.edu/~pugh/java/memoryModel/

Java Sound Resources
- Resources related to API, including example code and FAQ.
- http://www.jsresources.org/

Java Technology Center for Compaq Alpha Systems
- Documentation and downloads for Alpha systems.
- http://h18012.www1.hp.com/java/alpha/

The Java Lobby
- Independent organization that supports the promise of Java's "Write Once, Run Anywhere" (WORA) promise. Includes news resources, product announcements, sample book chapters, and forums.
- http://www.javalobby.org/

Java Zone
- DevX community with discussion forums, FAQs, tutorials, and technical articles.
- http://www.devx.com/java/

Jaagle
- Links to components, applets, and information organized by category.
- http://www.jaagle.com/

DevDaily Java Resources
- Applet and tutorial directory, with news and links to other resources.
- http://devdaily.com/java/

KickJava.com
- Offers user provided examples of class/method usage.
- http://kickjava.com/

programmershelp: Java section
- Collection of applets, applets, FAQs, and software resources.
- http://www.programmershelp.co.uk/java.php

Java Gazette
- Resource collection on Apptivity, architecture, and user interfaces.
- http://www.javagazette.com/

JavaJunkies
- Community for developers, allows users to post questions about the language and discuss topics with like-minded individuals.
- http://www.javajunkies.org/

JavaSide.com
- Directory of applets (with and without source), games, tricks, tips, news, and links.
- http://www.javaside.com/us/

Cetus Links
- Collection of links to articles, tutorials, and FAQs.
- http://www.cetus-links.org/oo_java.html

JSurfer
- News, links, and forums.
- http://www.jsurfer.org/

ITtoolbox Java
- Portal with newswires, tutorials, large resource directory, events, and jobs.
- http://java.ittoolbox.com/

JavaRanch
- Includes study material for Java certification, a discussion forum and articles geared towards Java beginners.
- http://www.javaranch.com/

Programmers Heaven
- Links, articles, tutorials, and message boards.
- http://www.programmersheaven.com/zone13/

JZ Ventures Java Links
- Collection of applets, tutorials, code, and API documentation.
- http://www.jzventures.com/jazjava.htm

JPackage
- Project providing a set of Linux RPM packages of software written in Java.
- http://www.jpackage.org/

Woodger's Java Resources
- Original articles on language-level issues, as well as client and server-side development.
- http://www.woodger.ca/jv_top.htm

Focus on Java
- Resources from About.com. Features links, FAQs, tutorials, and articles.
- http://java.about.com/

SwTech.com
- Article and resource collection.
- http://www.sw-technologies.com/java/

Jars.com
- Review service of applets, applications, and JavaBeans.
- http://www.jars.com/

The Java Boutique
- A collection of applets, applications, and servlets. Also features developer news, tutorials, and reviews.
- http://javaboutique.internet.com/

Freewarejava.com
- Directory of applets, tutorials, references, and articles.
- http://freewarejava.com/

Marty Hall's Java Programming Resources
- FAQs, tutorials, compiler and browser download sites, documentation, book lists, and applet and class library collections.
- http://www.apl.jhu.edu/~hall/java/