Carrot2 is an Open Source Search Results Clustering Engine. It could cluster the search results from various sources and generates small collection of documents. Carrot2 offers ready-to-use components for fetching search results from various sources including YahooAPI, GoogleAPI, Bing API, eTools Meta Search, Lucene, SOLR, Google Desktop and more.
 <img src="/AppImages/Article/carrot2-search.jpg" alt="" class="float-center"> 
 It is implemented in Java. It has native API implementation in CSharp. Java runtime is not required and the performance is comparable to Java. It has support of REST interface which could be called from PHP and Ruby. 
 If you have search instances running in multiple nodes and search has to perform across the nodes, then you need a way to combine those results, filter and sort them. Carrot2 helps to do this job efficiently. It is well suited to work with Lucene, Solr and Nutch. 
 Carrot2 could be even called as meta search engine. It has built-in functionality to fetch results from all popular search-engines and combine them. It also offers supporting tools like command-line and GUI application to experiment with this product. Firefox and IE search plug-in is also available. 
 
 Demo: <A HREF="http://search.carrot2.org/stable/search" target="_blank">http://search.carrot2.org/stable/search</A>

Carrot2 is an Open Source Search Results Clustering Engine. It could cluster the search results from various sources and generates small collection of documents. Carrot2 offers ready-to-use components for fetching search results from various sources including YahooAPI, GoogleAPI, Bing API, eTools Meta Search, Lucene, SOLR, Google Desktop and more.

Carrot2 - Search Results Clustering Engine

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can build and walk parse trees. Twitter search uses ANTLR for query parsing, with over 2 billion queries a day. 
 
The languages for Hive and Pig, the data warehouse and analysis systems for Hadoop, both use ANTLR. Lex Machina uses ANTLR for information extraction from legal texts. Oracle uses ANTLR within SQL Developer IDE and their migration tools. NetBeans IDE parses C++ with ANTLR. The HQL language in the Hibernate object-relational mapping framework is built with ANTLR.

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can build and walk parse trees. Twitter search uses ANTLR for query parsing, with over 2 billion queries a day. 


ANTLR - ANother Tool for Language Recognition

Protocol buffers are a language-neutral, platform-neutral extensible mechanism for serializing structured data. You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages. 

Protocol Buffers - Google's data interchange format

JLine is a Java library for handling console input. It is similar in functionality to BSD editline and GNU readline. People familiar with the readline/editline capabilities for modern shells (such as bash and tcsh) will find most of the command editing features of JLine to be familiar. Its features include Command history, Command completion using tab, Custom key binding etc.

JLine - Java console input library

PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL.
 
Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code in Java, C, C++, C#, Groovy, PHP, Ruby, Fortran, JavaScript, PLSQL, Apache Velocity, Scala, Objective C, Matlab, Python, Go, Swift and Salesforce.com Apex and Visualforce.

PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL.

PMD - An extensible cross-language static code analyzer

JForum is a powerful and robust discussion board system implemented in Java. It provides an attractive interface, an efficient forum engine, an easy to use administrative panel, an advanced permission control system and much more. Built from the ground up around a MVC framework, it can be deployed on any servlet container or Application Server, such as Tomcat, Resin and JBoss. Its clean design and implementation make JForum easy to customize and extend. It is fast ans scalable. JForum caches frequently accessed data to avoid excessive querying of the database. 

 Its features include: 
 <UL>
	<LI>Easy installation through graphical web interface</LI>
	<LI>Unlimited forums, categories, and topics.</LI>
	<LI>Support for several popular databases, including MySQL, PostgreSQL, Oracle and HSQLDB.</LI> 
	<LI>Karma - Rate messages and users.</LI> 
	<LI>Bookmarks.</LI> 
	<LI>Easy migration from phpBB.</LI> 
	<LI>Friendly URLs.</LI>
	<LI>Listing of currently online users.</LI>
	<LI>RSS syndication.</LI>
	<LI>Email notifications for topics on private messages.</LI> 
	<LI>Integrated private message system.</LI> 
	<LI>Topics can be locked/unlocked and moved between forums.</LI>
	<LI>Robust security system.</LI> 
	<LI>Supports individual themes/templates for users.</LI> 
	<LI>Support for different languages; easy to add new languages.</LI>
	<LI>User and Group management.</LI>
 </UL>

JForum is a powerful and robust discussion board system implemented in Java. It provides an attractive interface, an efficient forum engine, an easy to use administrative panel, an advanced permission control system and much more.

JForum

LiveGraph is a framework for real-time data visualisation, analysis and logging. It has a real time plotter that can automatically update graphs of your data while it is still being computed by your application. LiveGraph reads files in a simple CSV-style format. For applications developed in Java, LiveGraph additionally provides an API that handles all data logging and persistency issues. LiveGraph uses only very few computational resources for the updates as it is has specialised caching techniques. Transformation of data series between Linear, logarithm, unit interval, and time-plot transformations are supported.

LiveGraph is a framework for real-time data visualisation, analysis and logging. It has a real time plotter that can automatically update graphs of your data while it is still being computed by your application. LiveGraph reads files in a simple CSV-style format. For applications developed in Java, LiveGraph additionally provides an API that handles all data logging and persistency issues.

Live Graph - Plot and explore your data in real-time

CruiseControl is both a continuous integration tool and an extensible framework for creating a custom continuous build process. It includes dozens of plugins for a variety of source controls, build technologies, and notifications schemes including email and instant messaging. A web interface provides details of the current and previous builds.
 <img src="/AppImages/Article/crusiecontrol-img1.jpg" alt="" class="float-center">

CruiseControl is both a continuous integration tool and an extensible framework for creating a custom continuous build process. It includes dozens of plugins for a variety of source controls, build technologies, and notifications schemes including email and instant messaging. A web interface provides details of the current and previous builds.

CruiseControl - Continuous Integration Tool to automate build process

Scala is a pure-bred object-oriented language. Conceptually, every value is an object and every operation is a method-call. The language supports advanced component architectures through classes and traits. Even though its syntax is fairly conventional, Scala is also a full-blown functional language. It has everything you would expect, including first-class functions, a library with efficient immutable data structures, and a general preference of immutability over mutation.

Scala Language - Object-Oriented Meets Functional

OpenRefine (previously Google Refine) is a powerful tool for working with messy data: cleaning it; transforming it from one format into another; and extending it with web services and external data.



OpenRefine - Powerful tool for working with messy data

HyperSQL supports the widest range of SQL Standard features seen in any open source database engine. It offers a small, fast database engine which offers in-memory and disk-based tables and supports embedded and server modes. 
 Its major feature include: 
 <UL>
	<LI>Java stored procedures and functions</LI>
	<LI>Java triggers</LI>
	<LI>Extensive JDBC interface support </LI>
	<LI>Persistence</LI>
	<LI>Embedded (into Java applications) and Client-Server operating modes</LI>
	<LI>Multiple databases per JVM </LI>
	<LI>ODBC support</LI>
	<LI>simple GUI database management tools</LI>
 </UL>
 Commercial support is available.

HyperSQL supports the widest range of SQL Standard features seen in any open source database engine. It offers a small, fast database engine which offers in-memory and disk-based tables and supports embedded and server modes. It is a relational database engine written in Java, with a JDBC driver, conforming to ANSI SQL:2008. It alsi supports transaction isolation, multiversion concurrency and ACID, Java stored procedures, Scalability and lot more.

HyperSQL - Java Database

Pebble is a lightweight, Java EE blogging tool. It's small, fast and feature-rich with unrivalled ease of installation and use. Blog content is stored as XML files on disk and served up dynamically, so there's no need to install a database. All maintenance and administration can be performed through your web browser, making Pebble ideal for anybody who is constantly on the move or doesn't have direct access to their host. Its key features include
 <UL>
	<LI>Blogger and MetaWeblog API interface included for posting content via compatible tools.</LI>
	<LI>Tagging of content and a generation of a tagcloud.</LI>
	<LI>RSS enclosures for distributing files or podcasting.</LI>
	<LI>Link to your favorite social bookmarking site.</LI>
	<LI>Pluggable moderation, spam detection and CAPTCHA support.</LI>
	<LI>Bulk response management features to approve/reject/remove comments and TrackBacks.</LI>
	<LI>Capture of blog referers, requests and logs for viewing or export.</LI>
	<LI>Syndicate external newsfeeds.</LI>
	<LI>View blog entries by permalink, day or month.</LI>
	<LI>Text based and advanced searching.</LI>
	<LI>Multiple people can contribute to a single blog.</LI>
	<LI>Host more than a single blog for a project, group or community.</LI>
	<LI>Content in international character sets such as UTF-8.</LI>
 </UL>

Pebble is a lightweight, Java EE blogging tool. It's small, fast and feature-rich with unrivalled ease of installation and use. Blog content is stored as XML files on disk and served up dynamically, so there's no need to install a database. All maintenance and administration can be performed through your web browser, making Pebble ideal for anybody who is constantly on the move or doesn't have direct access to their host.

Pebble - Java EE blogging tool

Aperture is a Java framework for extracting and querying full-text content and metadata from various information systems. It could crawl and extract information from File system, Websites, Mail boxes and Mail servers. It supports various file formats like Office, PDF, Zip and lot more. Metadata information is extracted from image files. Aperture has a strong focus on semantics, metadata extracted could be mapped to predefined properties.

Aperture - Java framework for getting data and metadata

HtmlCleaner is HTML parser written in Java. HTML found on Web is usually dirty, ill-formed and unsuitable for further processing. HtmlCleaner reorders individual elements and produces well-formed XML. By default, it follows similar rules that the most of web browsers use in order to create Document Object Model. However, user may provide custom tag and rule set for tag filtering and balancing.

HtmlCleaner - HTML parser in Java

jMonkeyEngine is a game engine made for developers who want to create 3D games following modern technology standards. It helps to create games that run on any OpenGL 2 and 3-ready device with the Java Virtual Machine – web, desktop, or mobile. It supports Shaders, Lighting, Physics, Special Effects, Texturing, Terrian and lot more.

jMonkeyEngine - 3D Game Engine in Java 

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