WhatJar.co.uk
- A free resource allowing to locate third party Open Source libraries. It crawls the web to constantly index the Open Source libraries.
- http://www.whatjar.co.uk/

Quartz Enterprise Job Scheduler
- A job scheduling system that can be integrated with, or used along side any Java application. Quartz can be used to create simple or complex schedules for executing jobs, whose tasks are defined as standard Java components or EJBs. [Open source, Apache So
- http://www.opensymphony.com/quartz/

Javolution
- Java library for real-Time, embedded and high-performance applications.
- http://javolution.org/

CCAPI 2
- A financial library for automated stock trading, including many technical indicators and quote retreivers to fetch both intraday and historical stock quotes from various internet sources. [Open source, GPL]
- http://www.activestocks.eu/index.php?option=com_content&task=section&id=5&Itemid=37

JSpeechLib
- Speech synthesis library. [LGPL]
- http://pixel.recoil.org/java/jspeechlib/Readme.html

Java Generic Libraries (JGL)
- Class libraries that extend JDK libraries, providing many commonly-used algorithms and data structures. By Recursion Software, Inc. [Commercial]
- http://www.recursionsw.com/Products/jgl.html

Mouse Gestures
- A pure Java library for recognition and processing mouse gestures. [Open source, LGPL]
- http://www.smardec.com/products/mouse-gestures.html

XXL: eXtendable and fleXible Library
- Provides a powerful collection of index-structures, query operators and algorithms facilitating the performance evaluation of new query processing developments. [Open Source, LGPL]
- http://dbs.Mathematik.uni-marburg.de/?search=Research_Projects_XXL

Marauroa
- A Java framework for creating online multiplayer games. [Open source, GPL]
- http://arianne.sourceforge.net/index.php?arianne_url=servers/server_marauroa

Mandarax
- A Java class library for deduction rules. It provides an infrastructure for defining, managing and querying rule engine bases. [Open source, LGPL]
- http://mandarax.sourceforge.net/

SVNKit
- A pure Java Subversion (SVN) client library that provides high level of control over subversion repository operations. [Open source, BSD-like]
- http://svnkit.com/

Prova
- An open source rule based scripting language for information integration and agents in Java, combining imperative and declarative programming. Distributed agents communicating via JMS or JADE use reaction rules in a natural syntax.
- http://www.prova.ws

Code Generation Library
- A dynamic library used to extend Java classes and implement interfaces at runtime. [Open source, Apache Software License]
- http://cglib.sourceforge.net/

jProductivity Protection!
- A licensing framework that can be embedded into custom Java applications or components only allowing the permitted use according to the supplied license. [Commercial]
- http://www.jproductivity.com/products/protection/

The lamborne Package of Collection Classes
- Collection classes that complement and extend java.util .
- http://faculty.cs.wwu.edu/martin/Software%20Packages/lamborne/Default.htm

MirrorJNDI
- Java Naming and Directory Interface (JNDI) service provider for accessing arbitrary Java objects in a hierarchical namespace. [Open source, GPL]
- http://www.smardec.com/products/jndi.html

Adept Java Library
- A Java library including source code for the Adept Software Development System. Packages include a Java object database, advanced file I/O, caches, session management. [Open source, Artistic License]
- http://adept.marringtons.com/Java/Library/

Flux
- Java workflow engine, Java job scheduler, and Java business process management (BPM) engine. APIs are available for Java, J2EE, XML, and Web Services. Flux can also be used without programming via its user interfaces. [Commercial]
- http://www.fluxcorp.com/

JDring
- Task scheduling system for Java, similar to Unix cron and at daemons. Fires events at specified times. Alarms are added dynamically in any order and can be one-shot or repetitive. [Open Source, LPGL]
- http://www.jtheory.com/jdring.html

JICE
- An XML-based configuration engine for Java applications. It could be used any Java application - client-side and server-side applications, Swing and web applications. [Open source, LGPL]
- http://jicengine.sourceforge.net/

License4J
- A pure Java library for creating and validating licenses. [Commercial]
- http://www.smardec.com/products/license4j.html

If Then Technology's Java Tool Kit
- Consists of four Java components that provide streaming HTML-to-PDF conversion, streaming ZIP file generation, HTTP file uploading, and emailing.
- http://www.ifthentechnology.com/toolkit.asp

Java Plugin Framework (JPF)
- A general-purpose plug-in framework intended to help building scalable, extendable Java applications with low cost of maintenance. [Open source, LGPL]
- http://jpf.sourceforge.net

UnifiedIO
- Allows to access everything (files, streams, arrays) in same manner, and gives a clear difference between read only and read/write access, control over byte order, optimized reading over http. [Open Source, BSD]
- https://uio.dev.java.net/

PooliT
- Generic, extensible object-pooling library to cut down on object creation and garbage collection, thus improving performance. [Open Source, LGPL]
- http://www.ascent-phase.org/projects/poolit/

Java Caching Service
- Implementation of the JSR-107 JCache API. Its aim is to provide an open source alternative to commercial jcache implementations and deliver a fast distributed caching mechanism for java and j2ee. [Open source, LGPL]
- http://jcache.sourceforge.net/

My Java Tools
- General purpose Java tools libraries: Lib (Objects, Strings, Files, FileFormat, Web, Tools, ZipInput); run - a Java application that runs code from a URL; jsp - Universal JSP turns JSP language into Macro; Practical XML - a very simple XML library.
- http://myjavatools.com/

Side of Software Java Libraries
- Offers libraries for the Java platform, such as dated collections, print preview, report visualization, and an OODB. [Commercial]
- http://www.sideofsoftware.com/

Smartproxy
- A library to dynamically create proxy classes and instances. Features an introduction to the library, download links and some documentation. [Open source, BSD License]
- http://www.ggtools.net/smartproxy/

Orbital library
- A class library providing object-oriented representations and algorithms for logic, mathematics and artificial intelligence. It comprises theorem proving, computer algebra, search and planning, as well as learning algorithms.
- http://www.functologic.com/orbital/

JFreeReport
- A Java class library for generating reports. It provides a flexible printing functionality for Java applications and supports output to Printers and PDF, Excel, HTML and XHTML, PlainText, XML and CSV files. [Open source, LGPL]
- http://www.jfree.org/jfreereport/

CreditCardPack
- Provides EJB, GUI and non GUI components related to credit card data and data validation. By Keyoti Software.
- http://www.keyoti.com/products/creditcardpack/

JBeans
- A complete re-implementation of the java.beans packages. This project builds on the deficiencies of the Sun implementation to provide developers with a set of tools that can be used in everyday practice. The JBeans project provides more support for gettin
- http://jbeans.sourceforge.net/

ILOG JRules
- A business rule engine class library.
- http://www.ilog.com/products/rules/engines/jrules/

JDollars
- A Java class library for credit card transaction processing. [Open source, BSD License]
- http://jdollars.sourceforge.net/

Universal Resource Library
- An extendable implementation of the NetBeans Filesystems API providing transparent access to local, JAR, CVS, XML and FTP filesystems. [Open Source, MPL-like]
- http://openide.netbeans.org/fs/Library.html

Style Report Pro
- An advanced printing/report generation package for Java applications and applets. The core of Style Report/Pro is a Java class/Java bean library with a powerful API. It support PDF/RTF/HTML generation, charting, grouping/summarization and high performance
- http://www.codework.com/stylepro/product.html

JTemporal
- A framework of components providing functionality for time related applications (for the moment instant, period, mediators managing temporal associations). [Open source, LGPL]
- http://jtemporal.sourceforge.net/

JavaThis Utilities
- Java class library. The main objective is to provide a cross platform, multi-language set of utilities for use with Java applications.
- http://sourceforge.net/projects/jtutilities/

GenerationJava
- Generic collection of Java support classes. [Open Source]
- http://www.generationjava.com/projects/GenJavaCore.shtml

Java Collection Framework Toolbox
- Utility classes for the java collections framework. [Open source, GPL or LGPL]
- http://molaepipe.sourceforge.net/

A Text User Interface for the Java AWT
- Renders Java 1.1 GUIs written in AWT that do not implement custom graphics to a text console. [Open Source]
- http://www.bmsi.com/tuipeer/

JRoots
- Java Application Framework for business development. [Freeware]
- http://www.voodoosoft.de/

NovoSoft UML Library
- Provides the following services: implementation of complete UML 1.3 physical metamodel, easy to use interfaces, event notification, undo/redo support, reflective API, XMI loading/saving. [Open Source, LGPL]
- http://nsuml.sourceforge.net/

JSDL (Java for SDL)
- A binding for SDL (Simple DirectMedia Layer) written in java. Now you can use SDL and still program with Java. [Open source, LGPL]
- http://jsdl.sourceforge.net/

jX4
- Java-based object oriented platform for MUDs and other modular, possibly distributed applications. [Open Source]
- http://x4.dridus.com/jx4/about.php

JViewPro
- Report generator and print preview JavaBean.
- http://www.hexatech.com/jviewpro.html

The metaXa Project
- A meta architecture for the Java virtual machine.
- http://www4.informatik.uni-erlangen.de/Projects/PM/Java/

Mango
- A Java library consisting of a number of iterators, algorithms and functions, loosely inspired by the C++ Standard Template Library. [Open source, LGPL]
- http://www.jezuk.co.uk/cgi-bin/view/mango

Java Printing Library
- This library adds a higher layer of abstraction to the standard Java print API. It has an opened architecture and simplifies the printing of complex components (e.g. tables) and reports. An interactive print preview is also included.
- http://www.netcat.li/java-report-printing-library/index.html

WEBsina
- JLicense is a Java utility library for creating and validating license keys. AuthToken is Java utility library for generating and validating authentication tokens (i.e., an encrypt string). [Freeware, pay for sources]
- http://www.websina.com/products/

ThreadWorks
- A Java API that facilitates development and support of multi-threaded applications.
- http://www.dvt.com/

Jakarta Commons
- Collection of open source reusable Java components from the Apache/Jakarta community.
- http://jakarta.apache.org/commons/

Programmer's Friend
- Java utility libraries for text, IO, XML, database. Online javadocs. [Open source]
- http://www.programmers-friend.org/

Primitive Collections for Java
- A collections framework for primitive Java types. The framework supports all primitive types and includes bridges to the standard Java Collections Framework. [Open source, LGPL]
- http://pcj.sourceforge.net/

Lava Rocks
- Utilities such as printf, array manipulation, console mode dialogs, file management, text, and DES crypto. [Commercial]
- http://sharkysoft.com/software/java/lava/

Coroutine Package in Java
- An implementation of coroutines using Java 1.0 and threads - ported from a C version. [Freeware]
- http://www.cs.utah.edu/~gback/process/

Blackwood
- Integrating the Java platform with Mozilla. Features include a bridge to XPCOM, a Java DOM API, the Open JVM Integration (OJI) facility, a Java WebClient API, Plug-ins implemented in Java, called 'Pluglets', and embedding the layout engine into Java appli
- http://www.mozilla.org/projects/blackwood/

The VNet Class Library
- Collection of useful Java classes, including an XML generator and a simple editor. [Open Source, GPL]
- http://web.vee.net/projects/vnetclasslibrary/

ICEsoft
- ICEbrowser (HTML component for internet browsing in Java), ICEbox (a mail component), ICEtoolkit (a GUI toolkit based on lightweight AWT components) and ICEssl (a module provides support for secure networking over the Internet, and full support for both S
- http://www.icesoft.com/

JThreadKit
- Multithreading collection that provides common wrappers and synchronized implementations. [Commercial w/ demo]
- http://www.jthreadkit.com/

Applicet
- Framework for Applets and Applications. It replaces java.applet.Applet as superclass and includes easy-to-use Internationalization support. [Commercial/Freeware]
- http://users.belgacombusiness.net/arci/

Package util.concurrent
- This package provides standardized, efficient versions of utility classes commonly encountered in concurrent Java programming. It mainly consists of implementations of a few interfaces. [Open Source, Public Domain]
- http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html

simpleJ
- A collection of easy to use multi-purpose Javabeans providing commonly used methods for handling I/O, arithmetic, and general commonly used algorithms used in computer science. [Open source, BSD License]
- http://simplej.berlios.de/