Hibernate facilitated the storage and retrieval of domain objects via Object/Relational Mapping. Today, Hibernate is a collection of related projects enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping. Hibernate lets you develop persistent classes following natural Object-oriented idioms including inheritance, polymorphism, association, composition. It supports Oracle, DB2, MySQL, PostgreSQL, Sybase, Interbase, Microsoft SQL Server, Progress, SAP DB, and HypersonicSQL. It also provides support to do text search and Shard (horizontal partition) the database.
 <UL>
	<LI>Transparent Persistence</LI>
	<LI>High Performance</LI>
	<LI>Reliability and Scalability</LI>
	<LI>Extensibility: Hibernate is highly customizable and extensible. </LI>
	<LI>Support for Hibernate Query Language (HQL)</LI>
 </UL>

Hibernate facilitated the storage and retrieval of domain objects via Object/Relational Mapping.  Today, Hibernate is a collection of related projects enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping.

Hibernate - Relational Persistence for Java

FindBugs uses static analysis to look for bugs in Java code. it can analyze programs compiled for any version of Java. Eclipse and Maven plugins are available. FindBugs has been downloaded more than 700,000 times.

FindBugs - Static Analysis Tool for Java

ZK is the leading Ajax + Mobile framework that is designed to build amazing Java web applications in a quick, efficient and elegant manner without needing any knowledge on Ajax or JavaScript. Unlike other conventional web frameworks, ZK is renowned for its shallow learning curve and unique Server+client architecture offering users a high performance, high security and low maintenance framework at an enterprise level. Being component based and event driven, 200+ UI Ajax components are readily at hand including mega components such as spreadsheet, pivot table, calendar and numerous jQuery based components.

ZK is the leading Ajax + Mobile framework that is designed to build amazing Java web applications in a quick, efficient and elegant manner without needing any knowledge on Ajax or JavaScript. Unlike other conventional web frameworks, ZK is renowned for its shallow learning curve and unique Server+client architecture offering users a high performance, high security and low maintenance framework at an enterprise level.

ZK – Java Web Framework for Web and Mobile

HyperGraphDB is a general purpose, open-source data storage mechanism based on a powerful knowledge management formalism known as directed hypergraphs. While a persistent memory model designed mostly for Knowledge management, Artificial Intelligence and Semantic web projects, it can also be used as an embedded object-oriented database for Java projects of all sizes. It could also be used as graph database or as (non-SQL) relational database. 

 A P2P framework for distributed processing has been implemented for replication/data partitioning algorithms as well as client-server style computing. While it falls into the general family of graph databases, it is hard to categorize HyperGraphDB as yet another database because much of its design evolves around providing the means to manage structure-rich information with arbitrary layers of complexity. 

 Source code location: <A HREF="http://code.google.com/p/hypergraphdb" target="_blank">http://code.google.com/p/hypergraphdb</A>

HyperGraphDB is a general purpose, open-source data storage mechanism based on a powerful knowledge management formalism known as directed hypergraphs. While a persistent memory model designed mostly for Knowledge management, Artificial Intelligence and Semantic web projects, it can also be used as an embedded object-oriented database for Java projects of all sizes. It could also be used as graph database or as (non-SQL) relational database.

HyperGraphDB - Database for Storing Strongly-Typed Hypergraphs

Jackson is a multi-purpose Java library for processing JSON data format. This project contains core low-level incremental ("streaming") parser and generator abstractions used by Jackson Data Processor. It also includes the default implementation of handler types (parser, generator) that handle JSON format. 

Jackson JSON - JSON Parser in Java

WildFly is a flexible, lightweight, managed application runtime that helps you build amazing applications. In the highly optimized boot process of WildFly 8, services are started concurrently to eliminate unnecessary waits and to tap into the power of multi-core processors. It supports ultimate Web Performance & Scalability, Unified configuration & Management. Web Socket support, Fast Linking & Concurrent Loading, Easily Testable and lot more.



WildFly - JBoss Application Server

SonarQube is the open source platform for continuous inspection of code quality. SonarQube provides the capability to not only show health of an application but also to highlight issues newly introduced. With a Quality Gate in place, you can fix the leak and therefore improve code quality systematically. Code analyzers can detect tricky issues such as null-pointers dereferences, logic errors, resource leaks.

Sonarqube - Continuous Code Quality

LanguageTool is an Open Source proofreading software for English, French, German, Polish, Russian, and more than 20 other languages. It finds many errors that a simple spell checker cannot detect. Receive tips on how to improve your text (including punctuation advice etc.) while typing an e-mail, a blog post or just a simple tweet. Whatever language you're using, LanguageTool will automatically detect it and provide suggestions. 

LanguageTool - Style and Grammar Checker for 25+ Languages

Pentaho is the open source business intelligence leader. Thousands of organizations globally depend on Pentaho to make faster and better business decisions that positively impact their bottom lines. Download the Pentaho BI Suite today if you want to speed your BI development, deploy on-premise or in the cloud or cut BI licensing costs by up to 90%. <A HREF="http://reporting.pentaho.org/" target="_blank">Pentaho Reporting</A> is a collection of open source projects primarily focused on the creation, generation and distribution of rich and sophisticated report content from all sources of information.

Pentaho is the open source business intelligence leader. Thousands of organizations globally depend on Pentaho to make faster and better business decisions that positively impact their bottom lines. Download the Pentaho BI Suite today if you want to speed your BI development, deploy on-premise or in the cloud or cut BI licensing costs by up to 90%.

Pentaho

XOM is a new XML object model. It is a tree-based API for processing XML with Java that strives for correctness, simplicity, and performance, in that order. XOM is fairly unique in that it is a dual streaming/tree-based API. Individual nodes in the tree can be processed while the document is still being built. The enables XOM programs to operate almost as fast as the underlying parser can supply data. You don't need to wait for the document to be completely parsed before you can start working with it. XOM is very memory efficient. If you read an entire document into memory, XOM uses as little memory as possible.

XOM is a new XML object model. It is a tree-based API for processing XML with Java that strives for correctness, simplicity, and performance, in that order.

XOM - XML object model in Java

Checkstyle is a tool to help programmers write Java code that adheres to a coding standard. Checkstyle is highly configurable and can be made to support almost any coding standard. Checkstyle provides checks that find class design problems, duplicate code, or bug patterns like double checked locking. This tool could be integrated as Ant task. Plugins are available for Eclipse, Netbeans, QALab, Emacs etc.

Checkstyle is a tool to help programmers write Java code that adheres to a coding standard. Checkstyle is highly configurable and can be made to support almost any coding standard. Checkstyle provides checks that find class design problems, duplicate code, or bug patterns like double checked locking. This tool could be integrated as Ant task.

Checkstyle - Checks Java coding standard

SpagoBI is the only entirely open source Business Intelligence suite. It covers all the analytical areas of Business Intelligence projects, with innovative themes and engines. SpagoBI offers a wide range of entirely open source analytical tools like Reporting, OLAP, Chart, Data mining, Real-time monitoring console, ETL. 
 Source code location: <A HREF="http://forge.ow2.org/projects/spagobi/" target="_blank">http://forge.ow2.org/projects/spagobi/</A>

SpagoBI is the only entirely open source Business Intelligence suite. It covers all the analytical areas of Business Intelligence projects, with innovative themes and engines. SpagoBI offers a wide range of entirely open source analytical tools like Reporting, OLAP, Chart, Data mining, Real-time monitoring console, ETL.

SpagoBI - Business Intelligence Suite

Eclipse SQL Explorer is a thin SQL client that allows you to query and browse any JDBC compliant database. It supports plugins with specialized functionality for individual databases (Oracle, DB2 and MySQL) and can be extended to include specialized support for other databases. It is available as standalone client as well as Eclipse plugin.

Eclipse SQL Explorer - SQL client

EJBCA is an enterprise class PKI Certificate Authority software. It supports SSL/TLS, Smart card logon to Windows and/or Linux, Signing and encrypting email (SMIME), Mobile PKI, Secure mobile networks and lot more.

Ejbca - PKI Certificate Authority software

OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.  OpenTSDB was written to address a common need: store, index and serve metrics collected from computer systems (network gear, operating
systems, applications) at a large scale, and make this data easily accessible and graphable.

OpenTSDB - A scalable, distributed Time Series Database.

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