Eclipse started as a Java IDE, but has since grown to be much, much more. Eclipse projects now cover static and dynamic languages; thick-client, thin-client, and server-side frameworks; modeling and business reporting; embedded and mobile; and, yes, we still have the best Java IDE.

Eclipse is the most popular and widely used IDE. It supports Java, PHP, C / C++, Mobile, Rich client applications, Modeling tools.

Eclipse

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

OpenNMS focuses on three main areas: 
	Service Polling - determining service availability and reporting on same. 
	Data Collection - collecting, storing and reporting on network information as well as generating thresholds. 
	Event and Notification Management - receiving events, both internal and external, and using those events to feed a robust notification system, including escalation 
 <UL>
	<LI>SNMP, HTTP, JMX Data collection</LI>
	<LI>Graphical Reports</LI>
	<LI>Polling / Monitoring </LI>
	<LI>Auto discovery</LI>
 </UL>

OpenNMS is the world's first enterprise grade network management platform developed under the open source model. A Java/XML-based Distributed Network & Systems Management platform.

OpenNMS

Apache Tika is a toolkit for detecting and extracting metadata and structured text content from various documents using existing parser libraries. It extracts text from following file formats. 

<ul>
<li>HyperText Markup Language</li>
<li>XML and derived formats</li>
<li>Microsoft Office document formats</li>
<li>OpenDocument Format</li>
<li>Portable Document Format</li>
<li>Electronic Publication Format</li>
<li>Rich Text Format</li>
<li>Compression and packaging formats</li>
<li>Text formats</li>
<li>Audio formats</li>
<li>Image formats</li>
<li>Video formats</li>
<li>Java class files and archives</li>
<li>The mbox format</li>
</ul>

Apache Tika is a toolkit for detecting and extracting metadata and structured text content from various documents using existing parser libraries.

Tikka - A content analysis toolkit

Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache. Its features include: 
 <UL>
	<LI>Fast and Light Weight</LI>
	<LI>Scalable to hundreds of caches</LI>
	<LI>Multiple CacheManagers per virtual machine</LI>
	<LI>Distributed Caching</LI>
	<LI>Provides LRU, LFU and FIFO cache eviction policies</LI>
	<LI>Supports Object or Serializable caching</LI>
	<LI>Full implementation of JSR107 JCACHE API</LI>
	<LI>Extensible</LI>
	<LI>Persistence, Flush to disk on demand</LI>
	<LI>Supports as standalone server, SOAP cache server, RESTful cache server</LI>
	<LI>Works with Hibernate, Google App Engine </LI>
 </UL>

Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

Ehcache

c3p0 is an easy-to-use library for making traditional JDBC drivers "enterprise-ready" by augmenting them with functionality defined by the jdbc3 spec and the optional extensions to jdbc2. It provides (DriverManager-based) JDBC drivers with JNDI-bindable DataSources, including DataSources that implement Connection and Statement Pooling, as described by the jdbc3 spec and jdbc2 std extension. A connection pool is used to minimize the number of connections opened between application and database. Statement pool stores a partially compiled version of a statement in order to increase performance.

c3p0 is an easy-to-use library for making traditional JDBC drivers "enterprise-ready" by augmenting them with functionality defined by the jdbc3 spec and the optional extensions to jdbc2. It provides (DriverManager-based) JDBC drivers with JNDI-bindable DataSources, including DataSources that implement Connection and Statement Pooling, as described by the jdbc3 spec and jdbc2 std extension.

c3p0 - JDBC3 Connection and Statement Pooling

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

IceScrum is an J2EE application for using Scrum while keeping the spirit of a collaborative workspace. It also offers virtual boards with post-its for sprint backlog, product backlog and others. The tool offers everything that is in Scrum:
<ul>
	<li>The role management: Product 	Owner, ScrumMaster, Team member and StakeHolder</li>
	<li>The product backlog management with advanced features for prioritizing stories</li>
	<li>Scrum lifecycle including a roadmap view</li>
	<li>Release planning</li>
	<li>Sprint backlog, as a task board facilitating the Scrum ceremonial</li>
	<li>Management of impediments</li>
	<li>Chart production such as burndown 	charts, velocity charts, cumulative flow diagram</li>
</ul>
Icescrum offers others agile practices like:
<ul>
	<li>Roadmap</li>
	<li>Vision</li>
	<li>Features</li>
	<li>User stories</li>
	<li>Acceptance tests associated to stories</li>
	<li>User roles</li>
	<li>Planning poker</li>
</ul>

IceScrum is an J2EE application for using Scrum while keeping the spirit of a collaborative workspace. It also offers virtual boards with post-its for sprint backlog, product backlog and others.

IceScrum - Agile Scrum tool

Java Standard Edition provides Java development kit and Runtime to develop and deploy Java programs. Developed by Sun and take over by Oracle. It has support for different environments like Desktop, Embedded, Web, Realtime etc. 

 Scripting languages framework extends support for Ruby, Python, and other languages. Full JDBC4 implementation providing improved XML support for Databases. It has built-in support for JNI, Reflection, JAAS, JMX and lot more. There could be any other VM but no one could match its features.

Java Standard Edition provides Java development kit and Runtime to develop and deploy Java programs. Developed by Sun and take over by Oracle. It has support for different environments like Desktop, Embedded, Web, Realtime etc.

Java SE - Creator of 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

JMeter is a pure Java desktop application designed to load test functional behavior and measure performance. It may be used to test performance both on static and dynamic resources (files, Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers and more). It can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types. 

 It could do performance test for Web application, Web services, Database, LDAP, JMS, Mail. It produces graphical analysis of test report. Test results could be cached offline. Data analysis and visualization plugins allow great extensibility.

JMeter is a pure Java desktop application designed to load test functional behavior and measure performance. It may be used to test performance both on static and dynamic resources (files, Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers and more). It can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types.

JMeter - Load and Performance tester

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

CloudStack CE is an open source Infrastructure-as-a-Service (IaaS) software platform, which enables users to build, manage and deploy compute cloud environments. 

 The <A HREF="http://cloud.com/" target="_blank">Cloud.com</A> approach to cloud computing is a new approach to how companies can quickly and easily build, manage and deploy private and public clouds. The Cloud.com CloudStack provides a turnkey solution for delivering virtual datacenters as a service—delivering all of the essential components used to build, deploy and manage multi-tier and multi-tenant cloud applications in a simple to install software package. 
 
 By using Cloud.com Cloud Stack as the foundation for infrastructure clouds, datacenter operators can quickly and easily build cloud services within their existing infrastructure to offer on-demand, elastic cloud services. Additional tools simplifies Administration, Security, Billing.

CloudStack CE is an open source Infrastructure-as-a-Service (IaaS) software platform, which enables users to build, manage and deploy compute cloud environments.

CloudStack - Infrastructure-as-a-Service (IaaS) software platform

The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model. Cassandra is suitable for applications that can't afford to lose data. Data is automatically replicated to multiple nodes for fault-tolerance. 

 Cassandra provides support for Scale out, load balancing, cluster growth, Flexible schema, Key-oriented queries and CAP theorem (Consistency, Availability, Partition tolerance). It is in use at Digg, Facebook, Twitter, Reddit, Rackspace, Cloudkick, Cisco and more companies.

The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model. Cassandra is suitable for applications that can't afford to lose data. Data is automatically replicated to multiple nodes for fault-tolerance.

Cassandra - Scalable Distributed Database

PrimeFaces is a lightweight component suite for Java Server Faces 2.0 featuring 100+ rich set of JSF components (HtmlEditor, Dialog, AutoComplete, Charts and many more). It has built-in ajax support. It supports mobile UI kit to create mobile web applications for handheld devices like IPhone, Palm, Android, Blackberry, Windows Mobile and more.

PrimeFaces - JSF component suite

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