Development Tools

Bean Scripting Framework
Architecture for incorporating scripting into Java applications, applets and servlets. [Open Source, IBM Public License]
http://jakarta.apache.org/bsf/

BEanACTION
Recursive JavaBeans editor for constructing component-based software. [Open Source, GPL]
http://beanaction.sourceforge.net/

Codemesh, Inc.
Information on JunC++ion for integrating Java classes with C++, JMS Courier which lets you integrate C++ into any JMS vendor environment, and JuggerNET, which integrates Java and .NET by generating .NET proxy classes for Java classes. For Windows, Linux, and Solaris. [Commercial]
http://www.codemesh.com/

EPP, an Extensible Pre-Processor kit
A powerful framework which supports implementation preprocessors, source-code analyzers, source-code translators for Java. [Freeware]
http://staff.aist.go.jp/y-ichisugi/epp/

Jarhoo
An online search engine providing Package and Jar File location information for Java classes. Useful when getting ClassNotFoundExceptions or when importing classes into Java code.
http://www.jarhoo.com

JavaToolbox
Directory of the existing development tools, libraries and add-ins for Java/J2EE. Freeware, open source, as well as commercial products, organized in multiple categories.
http://javatoolbox.com/

jCVS
Java based CVS Client, with graphical user interface. [Open Source, GPL]
http://www.trustice.com/java/jcvs/index.shtml

Jenv
A programming tool for those who used to make their code by hand. It consists of a simple editor with integrated compilation and running facilities. [Open source]
http://olebon.i8.com/

JGRASP: Graphical Representations of Algorithms, Structures and Processes
Illustrates program control flow graphically in the blank indentation space of source code. [Freeware]
http://www.eng.auburn.edu/department/cse/research/grasp/

jMetra
A tool for collecting code metrics for Java/J2EE projects into JavaDoc-styled HTML to analyze project metrics over time. [Freeware, req. registration]
http://hypercision.com/jmetra/

JoGa
A java class file optimizer which uses different optimization techniques. Can be used with J2ME and J2SE class files.
http://www.nq4.de/joga/

LogSequencer
A tool that reads your log files and generates Sequence Diagrams based on the logged information. Use it for documentation and debugging.
http://www.logsequencer.com/

Netscape Directory SDK for Java: Source Code Release
Enables you to write applications which access, manage, and update the information stored in an LDAP directory. C and Perl versions also available. [Open Source]
http://www.mozilla.org/directory/javasdk.html

ObjectLedge
A platform for building applications in Java 2 Standard and Enterprise Edition environments. It provides basic building blocks of the applications, a few extensions to the Pico framework, customized containers for easy deployment of applications in command line, daemon, and J2EE servlet environments. [Open source, BSD license]
http://objectledge.org/

oneClickJava
An easy to use free Java Development Kit configuration tool for beginner programmers. Written in Perl. [Open source, BSD-like]
http://oneclickjava.sourceforge.net/

Programmerworld.NET - Java Tools
Categorized list of Java development tools.
http://programmerworld.net/resources/java.htm

Qbeans
An application framework of JavaBeans that assists developers to assemble service-oriented Java Swing applications from business domain models.
http://www.qbeans.com/

Reva Soft
Provides a "Ultra Light Client for Java," a Model-View-Controller architected lightweight client for server-based computing. Also provides overviews of company, services, and product support.
http://www.revasoft.com/

Scort
Allows web browsers to access terminal-based information systems without modifying existing applications.
http://www.scort.com/

SourceCafe
A Java code generator that automatically generates up to 80% of web application code. It simplifies database-driven web application development by generating a working prototype in a matter of minutes.
http://www.sourcecafe.com/

Versata, Inc.
Business-rules development platform for J2EE application creation and management.
http://www.versata.com/

Zaval Java Resource Editor
A visual editor for resource files. The files being produced by this tool is fully compatible with ResourceBundle expectations. Has been tested on Win/Unix/Linux/Mac platforms.
http://www.zaval.org/products/jrc-editor/