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Open Source Software in Java(tm)
- Google Web Toolkit -
Google Web Toolkit (GWT) is an open source Java software development framework that makes writing AJAX applications like Google Maps and Gmail easy for developers who don't speak browser quirks as a second language. Writing dynamic web applications today is a tedious and error-prone process; you spend 90% of your time working around subtle incompatibilities between web browsers and platforms, and JavaScript's lack of modularity makes sharing, testing, and reusing AJAX components difficult and fragile.
GWT lets you avoid many of these headaches while offering your users the same dynamic, standards-compliant experience. You write your front end in the Java programming language, and the GWT compiler converts your Java classes to browser-compliant JavaScript and HTML.
- AspectJ -
AspectJ is a seamless aspect-oriented extension to the Java programming language, Java platform compatible and easy to learn and use. AspectJ enables the clean modularization of crosscutting concerns such as: error checking and handling, synchronization, context-sensitive behavior, performance optimizations, monitoring and logging, debugging support, multi-object protocols.
- SnipSnap -
SnipSnap is a free and easy to install weblog and wiki tool written in Java.
- Ant -
Ant is a software tool for automating software build processes. It uses XML to describe the build process and its dependencies.
- BCEL -
The Byte Code Engineering Library is intended to give users a convenient possibility to analyze, create, and manipulate (binary) Java class files (those ending with .class). Classes are represented by objects which contain all the symbolic information of the given class: methods, fields and byte code instructions, in particular.
- OpenCMS -
OpenCms is a professional level Open Source Website Content Management System. OpenCms helps to create and manage complex websites easily without knowledge of html. An integrated WYSIWYG editor with a user interface similar to well known office applications helps the user creating the contents, while a sophisticated template engine enforces a site-wide corporate layout. As true Open Source software, OpenCms is completely free of licensing costs.
- Java Caching System -
JCS is a distributed caching system written in java for server-side java applications. It is intended to speed up dynamic web applications by providing a means to manage cached data of various dynamic natures. Like any caching system, the JCS is most useful for high read, low put applications. Dynamic content and reporting systems can benefit most. However, any site that repeatedly constructs pages, dropdowns, or common search results form a database that is updated at intervals (rather than across categories continuously) can improve performance and scalability by implementing caching. Latency times drop sharply and bottlenecks move away from the database in an effectively cached system.
- JFreeChart -
JFreeChart is a free Java class library for generating charts, including:
* pie charts (2D and 3D)
* bar charts (regular and stacked, with an optional 3D effect)
* line and area charts
* scatter plots and bubble charts
* time series, high/low/open/close charts and candle stick charts
* combination charts
* Pareto charts
* Gantt charts
* wind plots, meter charts and symbol charts
* wafer map charts
- Claros Chat -
Claros Chat is a Web based instant messaging client which is capable of talking with a Jabber server. Claros Chat is well tested with Google Talk and it supports all major browsers such as Internet Explorer, Firefox, Safari, and Mozilla. It has a minimalistic and an elegant user interface which looks and feels a lot like a desktop application, since it uses AJAX. With the help of a Jabber server, creating your own corporate chat network and chatting with other networks such as MSN, ICQ, AOL, Yahoo IM is possible.
- PMD -
PMD scans Java source code and looks for potential problems like:
* Unused local variables
* Empty catch blocks
* Unused parameters
* Empty 'if' statements
* Duplicate import statements
* Unused private methods
* Classes which could be Singletons
* Short/long variable and method names
- Jalopy -
Jalopy is a source code formatter for the Sun Java programming language. It layouts any valid Java source code according to some widely configurable rules; to meet a certain coding style without putting a formatting burden on individual developers.
- Quilt -
Quilt is a Java software development tool that measures coverage , the extent to which unit testing exercises the software under test. It is optimized for use with the JUnit unit test package, the Ant Java build facility, and the Maven project management toolkit.
- Commons Collections -
Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities. There are many features, including:
* Bag interface for collections that have a number of copies of each object
* Buffer interface for collections that have a well defined removal order, like FIFOs
* BidiMap interface for maps that can be looked up from value to key as well and key to value
* MapIterator interface to provide simple and quick iteration over maps
* Type checking decorators to ensure that only instances of a certain type can be added
* Transforming decorators that alter each object as it is added to the collection
* Composite collections that make multiple collections look like one
* Ordered maps and sets that retain the order elements are added in, including an LRU based map
* Identity map that compares objects based on their identity (==) instead of the equals method
* Reference map that allows keys and/or values to be garbage collected under close control
* Many comparator implementations
* Many iterator implementations
* Adapter classes from array and enumerations to collections
* Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure
- Jakarta Commons CLI -
The Apache Commons CLI library provides an API for processing command line interfaces.
There are three stages to command line processing. They are the definition, parsing and interrogation stages.
- Jakarta DBCP -
DBCP is a database connection pool that relies on code in the Jakarta commons-pool package to provide the underlying object pool mechanisms that it utilizes. Applications can use the DBCP component directly or through the existing interface of their container / supporting framework.
- Heritrix -
Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project.
- Axion -
Axion is a small, fast, open source relational database system (RDBMS) supporting SQL and JDBC written in and for the Java programming language.
- OpenEJB -
A modular, configurable, and extendable EJB Container System that comes with Servers for both Local and Remote access
- Apache OFBiz (Apache Open For Business Project) -
The Apache Open For Business Project is an open source enterprise automation software project. By open source enterprise automation we mean: Open Source ERP, Open Source CRM, Open Source E-Business / E-Commerce, Open Source SCM, Open Source MRP, Open Source CMMS/EAM, and so on.
- Mule -
Mule is a light-weight messaging framework. It is a highly distributable object broker that can seamlessly handle interactions with other applications using disparate technologies, transports and protocols.
The Mule framework provides a highly scalable environment in which you can deploy your business components. Mule manages all the interactions between components transparently whether they exist in the same VM or over the internet and regardless of the underlying transport used.
Mule was designed around the Enterprise Service Bus architecture, which stipulates that different components or applications communicate through a common messaging bus, usually implemented using Jms or some other messaging server.
Mule goes a lot further by abstracting Jms and any other transport technology away from the business objects used to receive messages from the bus.
- Spring IDE -
Spring IDE is a graphical user interface for the configuration files used by the Spring Framework.
Spring IDE provides the following features:
* Project nature which supports a list of Spring bean config files and sets of bean config files (aka beans config sets)
* Incremental builder which validates all modified Spring bean config files defined in a Spring project
* View which displays a tree with all Spring projects and their Spring bean config files
* Image decorator which decorates all Spring projects, their bean config files and all Java classes which are used as bean classes
* Graph which shows all beans (and their relationships) defined in a single config file or a config set
* XML editor for Spring beans configuration files
* Extension of Eclipse's search facility to search for beans defined in the BeansCoreModel
* Wizard for creating a new Spring project
* Content contribution to Eclipse's ProjectExplorer with Spring artefacts
- Jakarta JXPath -
JXPath defines a simple interpreter of an expression language called XPath. JXPath applies XPath expressions to graphs of objects of all kinds: JavaBeans, Maps, Servlet contexts, DOM etc, including mixtures thereof.
- JMoney -
JMoney is a personal finance manager. It supports multiple accounts in different currencies, double entry banking, income/expense categories, various reports and Quicken file (QIF) exchange. It is built using the Eclipse RCP and can be extended using plug-ins.
- mvnForum -
mvnForum is an open source, powerful, easy to use, easy to setup bulletin board (forum) built on the Java J2EE technology (Jsp/Servlet). mvnForum is compatible with any Servlet Containers which supports Jsp 1.2 and Servlet 2.3.
- Apache POI -
The POI project is the master project for developing pure Java ports of file formats based on Microsoft's OLE 2 Compound Document Format. OLE 2 Compound Document Format is used by Microsoft Office Documents, as well as by programs using MFC property sets to serialize their document objects.
There following are ports, packages or components contained in the POI project:
* POIFS is the set of APIs for reading and writing OLE 2 Compound Document Formats.
* HSSF is the set of APIs for reading and writing Microsoft Excel 97(-XP) spreadsheets.
* HWPF is the set of APIs for reading and writing Microsoft Word 97(-XP) documents.
* HSLF is the set of APIs for reading and writing Microsoft PowerPoint 97(-XP) documents.
* HPSF is the set of APIs for reading property sets.
- GeoServer -
GeoServer is an open source server that connects your information to the Geospatial Web.
GeoServer allows to publish and to edit data using open standards. The information is made available in a large variety of formats as maps/images or actual geospatial data. GeoServer's transactional capabilities offer robust support for shared editing.
GeoServer supports WFS-T and WMS open protocols from the OGC to produce JPEG, PNG, SVG, KML/KMZ, GML, PDF, Shapefiles and more.
GeoServer is built on Geotools.
- CHEF -
The CompreHensive collaborativE Framework (CHEF) initiative has as its goal, the development of a flexible environment for supporting distance learning and collaborative work.
- TagSoup -
TagSoup is a SAX-compliant parser written in Java that, instead of parsing well-formed or valid XML, parses HTML as it is found in the wild: nasty and brutish, though quite often far from short. TagSoup is designed for people who have to process this stuff using some semblance of a rational application design. By providing a SAX interface, it allows standard XML tools to be applied to even the worst HTML.
- Eclipse -
Eclipse is a kind of universal tool platform - an open extensible IDE for anything and nothing in particular.
- IzPack -
IzPack is an installers generator for the Java platform. It produces lightweight installers that can be run on any operating system where a Java virtual machine is available. Depending on the operating system, it can be launched by a double-click or a simple 'java -jar installer.jar' on a shell. The most common use is to distribute applications for the Java platform, but you can also use it for other kinds of projects. The main benefit of IzPack is that it provides a clean and unique way of distributing a project to users using different operating systems.
- Excalibur -
Excalibur is an open source software project of The Apache Software Foundation that contains a lightweight, embeddable Inversion of Control container named Fortress that is written in java.
- Scarab -
The goal of the Scarab project is to build an Artifact tracking system that has the following features:
* A full feature set similar to those found in other Artifact tracking systems: data entry, queries, reports, notifications to interested parties, collaborative accumulation of comments, dependency tracking
* In addition to the standard features, Scarab has fully customizable and unlimited numbers of Modules (your various projects), Artifact types (Defect, Enhancement, Requirement, etc), Attributes (Operating System, Status, Priority, etc), Attribute options (P1, P2, P3) which can all be defined on a per Module basis so that each of your modules is configured for your specific tracking requirements.
* Built using Java Servlet technology for speed, scalability, maintainability, and ease of installation.
* Import/Export ability via XML allowing for easy migration from other systems (e.g. Bugzilla).
* Modular code design that allows manageable modifications of existing and new features over time.
* Fully customizable through a set of administrative pages.
* Easily modified UI look and feel.
* Can be integrated into larger systems by re-implementing key interfaces.
* Is a ready to use issue management system
- Spring -
Spring is a layered Java/J2EE application framework, based on code published in Expert One-on-One J2EE Design and Development
- jTDS -
jTDS is an open source 100% pure Java (type 4) JDBC 3.0 driver for Microsoft SQL Server (6.5, 7, 2000 and 2005) and Sybase (10, 11, 12). jTDS is based on the work of the FreeTDS project and is currently the fastest complete JDBC driver for SQL Server and Sybase. Starting with release 0.7.1 jTDS is 100% JDBC 2.1 compatible, supporting forward-only and scrollable/updateable ResultSets, multiple concurrent (completely independent) Statements per Connection and implementing all of the DatabaseMetaData and ResultSetMetaData methods. As of version 0.9 most of the JDBC 3.0 features are also implemented.
Quite a few of the commercial JDBC drivers out there are based on jTDS (or FreeTDS), even if they no longer acknowledge this. jTDS has been tested with virtually all of the available JDBC-based database management tools and is the driver of choice for most of these (DataDino and Aqua Data Studio even contain it). jTDS is also becoming a common choice for enterprise-level applications: starting with release 0.8-rc1 jTDS passes the Hibernate test suite, making it the driver of choice for SQL Server.
- ActiveMQ -
ActiveMQ is an open source, Apache 2.0 licenced Message Broker and JMS 1.1 implementation which integrates seamlessly into Geronimo, light weight containers and any Java application.
- MX4J -
MX4J is a project to build an Open Source implementation of the Java(TM) Management Extensions (JMX) and of the JMX Remote API (JSR 160) specifications, and to build tools relating to JMX.
- Jakarta Taglibs -
This project is an open-source repository for JSP custom tag libraries and associated projects, such as TagLibraryValidator classes and extensions to page-creation tools to support tag libraries.
- Quartz -
Quartz is an open source job scheduling system that can be integrated with, or used along side virtually any J2EE or J2SE application. Quartz can be used to create simple or complex schedules for executing tens, hundreds, or even tens-of-thousands of jobs; jobs whose tasks are defined as standard Java components or EJBs.
- ICU4J -
ICU4J is a java libraries providing Unicode and Globalization support for software applications.
Here are a few highlights of the services provided by ICU:
* Code Page Conversion: Convert text data to or from Unicode and nearly any other character set or encoding. ICU's conversion tables are based on charset data collected by IBM over the course of many decades, and is the most complete available anywhere.
* Collation: Compare strings according to the conventions and standards of a particular language, region or country. ICU's collation is based on the Unicode Collation Algorithm plus locale-specific comparison rules from the Common Locale Data Repository, a comprehensive source for this sort of data.
* Formatting: Format numbers, dates, times and currency amounts according the conventions of a chosen locale. This includes translating month and day names into the selected language, choosing appropriate abbreviations, ordering fields correctly, etc. Again, ICU uses data from the Common Locale Data Repository.
* Unicode Support: ICU closely tracks the Unicode standard, providing easy access to all of the many Unicode character properties, Unicode Normalization, Case Folding and other fundamental operations as specified by the Unicode Standard.
* Regular Expression: ICU's regular expressions fully support Unicode while providing very competitive performance.
* Bidi: support for handling text containing a mixture of left to right (English) and right to left (Arabic or Hebrew) data.
* Text Boundaries: Locate the positions of words, sentences, paragraphs within a range of text, or identify locations that would be suitable for line wrapping when displaying the text.
- Log4j -
Log4j is a logging tool that allows you to log at runtime without modifying the application binary. The log4j package is designed so that logging statements can remain in shipped code without incurring a heavy performance cost. Logging behavior can be controlled by editing a configuration file, without touching the application binary.
- Grendel -
Grendel is a mail/news reader entirely written in Java. Its goal is to be a true cross-platform application with a feature set that satisfies the poweruser.
- JSch -
JSch is a pure Java implementation of SSH2. JSch allows you to connect to an sshd server and use port forwarding, X11 forwarding, file transfer, etc., and you can integrate its functionality into your own Java programs.
- Apache James -
The Apache JAMES Project delivers a rich set of open source solutions, written in Java, related to internet mail and news.
JAMES is organized into subprojects with JAMES Server and the Mailet API as their core.
Apache JAMES is a project of The Apache Software Foundation (ASF) which encourages a collaborative, consensus-based development process under an open software license.
The ASF maintains other Java projects which may also be of interest. These are detailed on the ASF Projects page.
We recommended that users of JAMES products subscribe to the JAMES users mailing list.
- ProGuard -
ProGuard is a free Java class file shrinker and obfuscator. It can detect and remove unused classes, fields, methods, and attributes. It can then rename the remaining classes, fields, and methods using short meaningless names. The resulting jars are smaller and harder to reverse-engineer.
- FOP -
FOP is an XSL formatter written in Java. It is used in conjunction with an XSLT transformation engine to format XML documents into PDF.
- ANTLR -
ANother Tool for Language Recognition, (formerly PCCTS) is a language tool that provides a framework for constructing recognizers, compilers, and translators from grammatical descriptions containing Java, C#, or C++ actions. ANTLR provides excellent support for tree construction, tree walking, and translation.
- Cayenne -
Cayenne is a powerful, full-featured Java Object Relational Mapping framework. It is open source and completely free. One of the main Cayenne distinctions is that it comes with cross-platform modeling GUI tools. This places Cayenne in the league of its own, making it a very attractive choice over both closed source commerical products and traditional "edit your own XML" open source solutions.
- Liferay -
Liferay is a portal designed to deploy portlets that adhere to the Portlet API (JSR 168). Many useful portlets are bundled with the portal (Mail, Document Library, Calendar, Message Boards, etc)
- NetBeans Profiler -
NetBeans Profiler is a project to integrate the JFluid profiling technology, which is being developed by Sun, into the NetBeans IDE. The aim of this project is to provide a powerful and flexible profiling solution that is tightly integrated into the IDE workflow. As the size and complexity of Java applications grow, keeping their performance at the required level becomes progressively difficult. That is why we believe profiling should become a natural part of the development work cycle. To achieve that, we would like to make profiling easy-to-use and as unobtrusive as possible - and the JFluid technology that we use, with dynamic bytecode instrumentation at its heart, suits this goal perfectly.
- Ganttproject -
Ganttproject lets you plan projects using a Gantt chart. It is written in Java. GanttProject use a XML file format. It can export the project in HTML Web pages or PDF document (using XSLT) or image files.
- RSSOwl -
RSSOwl collects data from RSS-compliant sites. It lets you gather, organize, update, and store information from any compliant source in a convenient, easy to use interface, save selected information in various formats for offline viewing and sharing, and much more.
- Drools -
Drools is an Object-Oriented Rule Engine for Java. Drools is an augmented implementation of Forgy's Rete algorithm tailored for the Java language. Adapting Rete to an object-oriented interface allows for more natural expression of business rules with regards to business objects.
More importantly, Drools provides for declarative logic programming and is flexible enough to match the semantics of your problem domain. The various parts that compose a rule may be extended to lend domain-specific sense to the rule.
- SQuirreL SQL Client -
SQuirreL SQL Client is a graphical Java program that will allow you to view the structure of a JDBC compliant database, browse the data in tables, issue SQL commands etc. The minimum version of Java supported is 1.3
- Groovy -
Groovy is a new agile dynamic language for the JVM combining lots of great features from languages like Python, Ruby and Smalltalk and making them available to the Java developers using a Java-like syntax.
Groovy is designed to help you get things done on the Java platform in a quicker, more concise and fun way - bringing the power of Python and Ruby inside the Java platform.
Groovy can be used as an alternative compiler to javac to generate standard Java bytecode to be used by any Java project or it can be used dynamically as an alternative language such as for scripting Java objects, templating or writing unit test cases.
- Solr -
Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP APIs, caching, replication, and a web administration interface.
- Bouncy Castle Crypto -
The Bouncy Castle Crypto APIs is a lightweight cryptography API in Java with a provider for the JCE and JCA, a clean room implementation of the JCE 1.2.1, a library for reading and writing encoded ASN.1 objects and generator for:
* Version 1 and Version 3 X.509 certificates and PKCS12 files.
* Version 2 X.509 attribute certificates.
* S/MIME and CMS (PKCS7).
* OCSP (RFC 2560).
* TSP (RFC 3161).
* OpenPGP (RFC 2440).
The lightweight API works with everything from the J2ME to the JDK 1.5
- jCVS -
JCVS is a CVS client package written entirely in Java. JCVS provides a complete CVS client/server protocol package that allows any Java program to implement the complete suite of CVS operations. JCVS also provides a Swing based client that provides a commercial quality GUI client for CVS. Finally, jCVS provides a Servlet that allows any Servlet enabled web server to present any CVS repository on the internet for browsing and download.
- AbaGuiBuilder -
The Abacus Java GUI Builder is a WYSIWYG tool that allows the application developer to place UI Java swing components on the canvas and have it render exactly as you see on the screen.
- Velocity -
Velocity is a Java-based template engine. It permits web page designers to reference methods defined in Java code. Velocity can be used to generate web pages, SQL, PostScript and other output from templates. It can be used either as a standalone utility for generating source code and reports, or as an integrated component of other systems
- JUnit -
JUnit is a regression testing framework written by Erich Gamma and Kent Beck. It is used by the developer who implements unit tests in Java.
- Jakarta ORO -
The Jakarta-ORO Java classes are a 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. This library is the successor to the OROMatcher, AwkTools, PerlTools, and TextTools libraries originally from ORO, Inc. Despite little activity in the form of new development initiatives, issue reports, questions, and suggestions are responded to quickly.
- ArgoUML -
ArgoUML is a powerful yet easy-to-use interactive, graphical software design environment that supports the design, development and documentation of object-oriented software applications.
- Commons Validator -
Commons Validator provides the building blocks for both client side validation and server side data validation. It may be used standalone or with a framework like Struts.
- Struts -
The core of the Struts framework is a flexible control layer based on standard technologies like Java Servlets, JavaBeans, ResourceBundles, and XML, as well as various Jakarta Commons packages. Struts encourages application architectures based on the Model 2 approach, a variation of the classic Model-View-Controller (MVC) design paradigm.
- GatorMail -
GatorMail is a servlet-based Webmail built on the Struts framework. It was originally developed to meet the needs of the University of Florida. Efficient interaction with the mail store along with a low support overhead are the goals of the project.
- Jakarta Tomcat -
Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process.
- Axis -
Axis is the third generation of Apache SOAP (which began at IBM as "SOAP4J"). It also includes:
* a simple stand-alone server,
* a server which plugs into servlet engines such as Tomcat,
* extensive support for the Web Service Description Language (WSDL),
* emitter tooling that generates Java classes from WSDL.
* some sample programs, and
* a tool for monitoring TCP/IP packets.
- MaxQ -
MaxQ is a free web functional testing tool. It includes an HTTP proxy that records your test script, and a command line utility that can be used to playback tests. The proxy recorder automatically stores variables posted to forms, so you don't have to write that stuff by hand.
- JSPWiki -
A WikiWiki web clone written using JSPs and Servlets
- Apache ODE -
Apache ODE (Orchestration Director Engine) executes business processes written following the WS-BPEL standard. It talks to web services, sending and receiving messages, handling data manipulation and error recovery as described by your process definition. It supports both long and short living process executions to orchestrate all the services that are part of your application.
- Xerces -
The Xerces Java Parser 1.4.4 supports the XML 1.0 recommendation and contains advanced parser functionality, such as support for the W3C's XML Schema recommendation version 1.0, DOM Level 2 version 1.0, and SAX Version 2, in addition to supporting the industry-standard DOM Level 1 and SAX version 1 APIs.
- SwiXml -
SwiXml, is a small GUI generating engine for Java applications and applets. Graphical User Interfaces are described in XML documents that are parsed at runtime and rendered into javax.swing objects.
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