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Class Libraries
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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/

JDring - Java Alarm Scheduler
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://webtools.dyade.fr/jdring/

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

Byte Iterator class
Allows treating a byte array as a file. [Open Source, GPL]
http://www.theorem.com/java/ByteIterator.java

Bluefish Rules Engine
Simple Java/XML rules engine suitable for personalization, workflow, and business rules. [Open Source]
http://bfre.sourceforge.net/

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

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

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/

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/

PortAudio
A cross platform audio I/O library. [Open source]
http://www.portaudio.com/

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

Talkative
Set of Java, COM and JavaScript libraries which together can provide connectivity between all kinds of applications. [Open Source, GPL]
http://members.tripod.com/tanmaykm/work/download/talkative/index.html

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/

Flux, the Enterprise Job Scheduling Component
Performs job and task scheduling in Java and Java 2 Enterprise Edition (J2EE) environments [Commercial]
http://www.simscomputing.com/products/flux/

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

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

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/research/projects/xxl/

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/

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/

JET API
Java libraries and Java Beans providing access to 3270 and 6530 mainframe hosts.
http://www.platypuspartners.com/jetapi/jetapi.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, high resolution printing drivers. [Commercial]
http://www.codework.com/stylepro/product.html

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

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

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

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

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 getting and setting bean properties, type conversion, nested properties, indexed properties, and full JavaBeans. [Open source, LGPL]
http://jbeans.sourceforge.net/

Amber Archer
Includes classfile parser and writer, reloading classloader, UNIX syslog client protocol, an asynchronously updated Map, and cache and pool framework support. [Open source, GPL]
http://www.amberarcher.org/

Ataraxia
A generic internet gaming framework in Java providing a complete client/server and peer to peer networking and messaging layer and a modular game generation toolkit with particular effort on the card games. [Open source, GPL]
http://ataraxia.sourceforge.net/

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/

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/

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/

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/

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/

Protomatter
A collection of (hopefully) useful Open Source Java classes, including Syslog, JDBC Connection Pool, PAS - a lightweight application server framework, Object Pooling Framework. Also Base64 encoder/decoder, blocking queues, work queues, mutex locks utility classes. [Open source, LGPL]
http://protomatter.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/

JGraphT
A class library that provides mathematical graph-theory objects and algorithms. JGraphT supports a rich gallery of graphs and is designed to be powerful, extensible and easy to use. [Open source, LGPL]
http://jgrapht.sourceforge.net/

Windward Reports
A J2EE report engine in Adobe PDF, Word RTF, html with css, html 3.2 (no css), ascii text formats. Servlet, JSP examples with sources. [Commercial]
http://www.windwardreports.com/

Millstone UI library
A user interface library for development of networked Java applications. It provides a terminal independent component model that can be adapted to different terminal types and user interface themes. [Open source, LGPL]
http://millstone.org/

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/jgl.asp

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/

Marauroa
A Java framework for creating online multiplayer games. [Open source, GPL]
http://marauroa.sourceforge.net/

JMAC
A Java implementation of Monkey's Audio Compression decoder. It is a Java library that decodes, converts and plays Monkey's Audio files (.MAC, .APL, .APE) in real time. JMAC doesn't need JMF. It runs under J2SE. [Open source, LGPL]
http://jmac.sourceforge.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/

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/

JaXLib
A platform independent Java library provides efficient in-memory datastructures for objects and primitive types, I/O streams and a bunch of related utilities. Many tools for every day tasks like file system access, event handling and string manipulation are also bundled. [Open source]
http://www.jaxlib.org/

JSIS Semantic Parsing API
An API for tools performing semantic and syntactic source code analysis. JSIS extendeds capabilities of Java Parsers, Java Reflection, and a compilation unit manager into one package. [Free and commercial]
http://jsistools.com/jt/products/JSISLibrary/

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

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

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/

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

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 SSL 2.0 and SSL 3.0 protocols). [Commercial, trial versions]
http://www.icesoft.com/

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/

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 applications - includes a demonstration browser partially written in Java. [Open Source, MPL]
http://www.mozilla.org/projects/blackwood/

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/

Verge Archemedia Labs
Offers Tempo a software component that performs job scheduling and job queuing for J2EE applications. [Commercial]
http://www.vergenet.com/

Java Addition to Default Environment (JADE)
Customizable XML support, generic Matrix class, and automatic error calculation. [Open Source, LGPL]
http://jade.dautelle.com/

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

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/

BaseSys
A collection of Java packages. Over 100 classes among 11 packages offering from simple sort Vector to complex consistent framework for managing nested data structures independent from the data source. [Commercial]
http://www.thesdc.com/basesys/

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

JBrix Java Components
Open-source java libraries, in particular GUI, speech-recognition, and XML related components.
http://www.jbrix.org/index.html

Open Geospatial Datastore Interface (OGDI) for Java
A simple API that facilitates connectivity with various geospatial information data formats and/or products.
http://www.globalgeo.com/mapfusion/ogdi.asp

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

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

MD5 Hashing Class/Utility
Computes the MD5 hash of arrays of bytes. Can also be used in command-line mode. [Open Source, Public Domain]
http://www.jonh.net/~jonh/md5/MD5.java

Java Web Browser and XML Viewer
Clue Web Browser Components power Java applications to display HTML. HTML-XML Dual Viewer help developers to display both HTML and XML with a single Java component. [commercial]
http://www.netcluesoft.com/top.php3?cat=base&sub=home

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/

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

RealObjects Edit-on Pro
A WYSIWYG editor applet/component. Provides word processor-like features, like a spelling checker, for XHTML markup creation.
http://www1.realobjects.de/

JWAM Framework
Java-based object-oriented framework for interactive business applications. By APCON WPS. [Framework is commercial; other components are open source, BSD-like]
http://www.jwam.de/

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



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