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Open Source Software in Java
- 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.
- The Roller Weblogger -
A server-based weblogging software & a web application that is designed to support multiple simultaneous weblog users and visitors. Roller supports all of the latest-and-greatest weblogging features such as comments, WYSIWYG HTML editing, page templates, RSS syndication, trackback, blogroll management, and provides an XML-RPC interface for blogging clients such as w:bloggar and nntp//rss.
- Ant -
Ant is a software tool for automating software build processes. It uses XML to describe the build process and its dependencies.
- Talend -
Talend is a provider of open source data integration software.
Talend offers open, innovative and powerful data integration solutions, used primarily for integration between operational systems, ETL, and migration by organizations of all sizes.
- Javassist -
Javassist (Java programming assistant) is a load-time reflective system for Java. It is a class library for editing bytecodes in Java; it enables Java programs to define a new class at runtime and to modify a class file before the JVM loads it. Unlike other similar systems, Javassist provides source-level abstraction; programmers can modify a class file without detailed knowledge of the Java bytecode. They do not have to even write an inserted bytecode sequence; Javassist instead can compile a fragment of source text on line (for example, just a single statement). This ease of use is a unique feature of Javassit against other tools.
- 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.
- FindBugs -
FindBugs looks for bugs in Java programs. It can detect a variety of common coding mistakes, including thread synchronization problems, misuse of API methods, etc.
- 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.
- Cobertura -
Cobertura is a free Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. It is based on jcoverage.
Features of Cobertura:
* Can be executed from ant or from the command line.
* Instruments Java bytecode after it has been compiled.
* Can generate reports in HTML or XML.
* Shows the percentage of lines and branches covered for each class, each package, and for the overall project.
* Shows the McCabe cyclomatic code complexity of each class, and the average cyclomatic code complexity for each package, and for the overall product.
* Can sort HTML results by class name, percent of lines covered, percent of branches covered, etc. And can sort in ascending or decending order.
- 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.
- Apache Derby -
Apache Derby, an Apache DB subproject, is an open source relational database implemented entirely in Java and available under the Apache License, Version 2.0. Some key advantages include:
* Derby has a small footprint -- about 2 megabytes for the base engine and embedded JDBC driver.
* Derby is based on the Java, JDBC, and SQL standards.
* Derby provides an embedded JDBC driver that lets you embed Derby in any Java-based solution.
* Derby also supports the more familiar client/server mode with the Derby Network Client JDBC driver and Derby Network Server.
* Derby is easy to install, deploy, and use.
- 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.
- ServiceMix -
Apache ServiceMix is an open source distributed Enterprise Service Bus (ESB) and SOA toolkit built from the ground up on the semantics and APIs of the Java Business Integration (JBI) specification JSR 208 and released under the Apache license.
ServiceMix is lightweight and easily embeddable, has integrated Spring support and can be run at the edge of the network (inside a client or server), as a standalone ESB provider or as a service within another ESB. You can use ServiceMix in Java SE or a Java EE application server.
ServiceMix uses ActiveMQ to provide remoting, clustering, reliability and distributed failover.
- EclEmma -
EclEmma is a free Java code coverage tool for Eclipse, available under the Eclipse Public License. Internally it is based on the great EMMA Java code coverage tool, trying to adopt EMMA's philosophy for the Eclipse workbench.
- 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.
- GFP (Personal Finance Manager) -
GFP(Personal Finance Manager) is a software that aids on personal finances administration offering a variety of reports, charts and filtering data on screen where is possible to obtain important information for your financial health.
- 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.
- GeoTools -
GeoTools is an open source (LGPL) Java code library which provides standards compliant methods for the manipulation of geospatial data, for example to implement Geographic Information Systems (GIS) . The Geo Tools library implements Open Geospatial Consortium (OGC) specifications as they are developed, in close collaboration with the GeoAPI and GeoWidgets projects.
- LibreSource -
LibreSource is a versatile collaborative platform. Open Source, modular and highly customizable, LibreSource is adapted to the collaborative software development, groupware, community leading, e-archiving and Web publishing.
On a single server, LibreSource can host several projects, several groups of users, and grant fine grain access to the resources. Based on Java/J2EE technology, LibreSource is a modular web server that users can customize online by combining resources and rights: wiki pages, forum, trackers, SCMs, files, download areas, dropbox, forms, etc.
- HTML Parser -
A fast real-time parser for real-world 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
- GlassFish -
GlassFish is the name for the open source development project for bulding a Java EE 5 application server. It is based on the source code for Sun Java System Application Server PE 9 donated by Sun Microsystems and TopLink persistence code donated by Oracle. This project provides a structured process for developing a high quality application server that makes new features available faster than ever before. It is the response to Java developers who want access to the source code and the ability to contribute to the development of Sun's next generation application server which is based on GlassFish. This project is designed to encourage communication between Sun and Oracle engineers and the community and will enable all developers to participate in the application server development process.
- C-JDBC -
C-JDBC is a free open source database cluster middleware that allows any Java application (standalone application, servlet or EJB container, ...) to transparently access a cluster of databases through JDBC(tm). The database is distributed and replicated among several nodes and C-JDBC balances the queries among these nodes. C-JDBC handles node failures and provides support for checkpointing and hot recovery.
- 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.
- Commons Logging -
The Logging package is an ultra-thin bridge between different logging libraries. Commons components may use the Logging API to remove compile-time and run-time dependencies on any particular logging package, and contributors may write Log implementations for the library of their choice.
- Columba -
Columba is an Email Client written in Java, featuring a user-friendly graphical interface with wizards and internationalization support.
Its a powerful email management tool with features to enhance your productivity and communication.
- Jakarta Commons Net -
Jakarta Commons Net implements the client side of many basic Internet protocols. The purpose of the library is to provide fundamental protocol access, not higher-level abstractions. Therefore, some of the design violates object-oriented design principles. Our philosophy is to make the global functionality of a protocol accessible (e.g., TFTP send file and receive file) when possible, but also provide access to the fundamental protocols where applicable so that the programmer may construct his own custom implementations (e.g, the TFTP packet classes and the TFTP packet send and receive methods are exposed).
- 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.
- Jakarta Pluto -
Pluto is the Reference Implementation of the Java Portlet Specfication (JSR 168)
- Cougaar Memory Profiler -
The Cougaar memory profiler is a tool for debugging memory usage and leaks in any Java application. It features a scalable 100% Java design that is lighter weight than existing JVMPI-based profilers.
- XPlanner -
XPlanner is a web-based project planning and tracking tool for agile development teams
- 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.
- Acegi Security -
Acegi Security is a powerful, flexible security solution for enterprise software, with a particular emphasis on applications that use Spring. Using Acegi Security provides your applications with comprehensive authentication, authorization, instance-based access control, channel security and human user detection capabilities.
- 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.
- JGoodies Binding -
The JGoodies Binding synchronizes object properties with Swing components. And it helps you represent the state and behavior of a presentation independently of the GUI components used in the interface.
- 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.
- Claros inTouch -
Claros inTouch (previously known as Claros Webmail) is an Ajax communication suite with key features such as webmail, address book, post-it notes, calendar(in progress), built in instant messenger, rss reader, webdisk(in progress). It is an open source web application which features built in spam protection and instant messaging capabilities.
- 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.
- JDOM -
JDOM is, quite simply, a Java representation of an XML document. JDOM provides a way to represent that document for easy and efficient reading, manipulation, and writing. It has a straightforward API, is a lightweight and fast, and is optimized for the Java programmer. It's an alternative to DOM and SAX, although it integrates well with both DOM and SAX.
- Laszlo -
Laszlo is an open source platform for the development and delivery of rich Internet applications on the World Wide Web. It is released under the OSI-certified Common Public License.
The Laszlo platform consists of the LZX language and the Laszlo Presentation Server.
LZX is an XML and JavaScript description language similar in spirit to XUL and XAML. LZX enables a declarative, text-based development process that supports rapid prototyping and software development best practices.
The Laszlo Presentation Server (LPS) is a Java servlet that compiles LZX applications into executable binaries for targeted run-time environments. Laszlo currently targets the Flash Player. The LPS compiles LZX applications into SWF bytecode for the Flash Player, serves and caches these compiled applications to any Web browser enabled with Flash 5 or later, and proxies application requests for back-end XML data sources and web services.
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