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|Spring Hateoas||Library to support implementing representations for hyper-text driven REST web services.
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|[[Spring_Integration|Spring Integration]]||Framework for enterprise application integration.
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|Spring LDAP||library for simplifying LDAP operations, based on the pattern of Spring's JdbcTemplate.
|[[Oracle_WebLogic_Server|Oracle Weblogic]]||Java EE application server
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|[[VRaptor|VRaptor]]||Opensource MVC framework
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|[[DWR_(Java)|DirectWebRemoting]]||library that enables Java on the server and JavaScript in a browser to interact and call each other as simply as possible.
|Apache Turbine||Web application development framework to facilitate building secure web applications.
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|[[Apache_Tapestry|Apache Tapestry]]||Component-oriented Java web application framework
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|[[Apache_Struts_2|Apache Struts]]||Framework for building Servlet/JSP based web applications based on the MVC design paradigm
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|[[Apache_Sling|Apache Sling]]||Web framework for the Java platform designed to create content-centric applications on top of a JSR-170-compliant (a.k.a. JCR) content repository such as Apache Jackrabbit.
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|[[Jena_(framework)|Apache Jena]]||Web framework for Java. It provides an API to extract data from and write to RDF graphs
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|[[Apache_Cocoon|Apache Cocoon]]||Web application framework built around the concepts of pipeline, separation of concerns and component-based web development.
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|[[Apache_Click|Apache Click]]||Component oriented web application framework for the Java language and is built on top of the Java Servlet API
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|[[Xerces|Apache Xerces]]||Collection of software libraries for parsing, validating, serializing and manipulating XML.
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|[[Apache_ActiveMQ|Apache ActiveMQ]]||Messaging and Integration Patterns server.
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|[[Apache_Camel|Apache Camel]] ||Rule-based routing and mediation engine that provides a Java object-based implementation of the Enterprise Integration Patterns using an API to configure routing and mediation rules.
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|[[Apache_Solr|Apache Solr]]||Enterprise search platform
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|[[JUnit|JUnit]]||Unit testing framework
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|[[Apache_Velocity|Apache Velocity]]||Java-based template engine that provides a template language to reference objects defined in Java code
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|[[FreeMarker|FreeMarker Template]]||Java-based Template Engine, originally focusing on dynamic web page generation with MVC software architecture
|Apache BookKeeper||Replicated log service which can be used to build replicated state machines.
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|[[Apache_VXQuery|Apache VXQuery]]||Standards-compliant XML Query processor that is implemented in Java
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|Apache Blur||Large scale search system built on Apache Lucene and Apache Hadoop.
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|[[Apache_Giraph|Apache Giraph]]||Iterative graph processing system built for high scalability.
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|Apache DataFu||Collection of libraries for working with large-scale data in Hadoop.
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|[[Apache_Avro|Apache Avro]]||Remote procedure call and data serialization framework developed within Apache's Hadoop project.
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|[[Infinispan|Infinispan]]||Distributed in-memory key/value data store with optional schema
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|[[Apache_Flume|Apache Flume]]||Distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log data.
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|[[Apache_HBase|Apache HBase]]||Non-relational, distributed database modeled after Google's BigTable
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|[[Apache_Tomcat|Apache Tomcat]]||Tomcat Server, is an open-source Java Servlet Container
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|[[Oracle_WebLogic_Server|Oracle WebLogic]]||Java EE application server
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|[[Apache_Axis|Apache Axis]]||Implementation of the SOAP ("Simple Object Access Protocol") submission to W3C
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|[[Apache_Mahout|Apache Mahout]]||Project of the Apache Software Foundation to produce free implementations of distributed or otherwise scalable machine learning algorithms focused primarily in the areas of collaborative filtering, clustering and classification.
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|[[Apache_Samza|Apache Samza]]||Distributed stream processing framework.
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|[[Jena_(framework)|Apache Jena]]||Semantic Web framework for Java.
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|[[Apache_Oozie|Apache Oozie]]||Server-based workflow scheduling system to manage Hadoop jobs.
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|[[Apache_ZooKeeper|Apache Zookeeper]]||Centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services.
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|[[Apache_Accumulo|Apache Accumulo]]||Distributed key/value store that provides robust, scalable data storage and retrieval.
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|[[Akka_(toolkit)|Akka]]||Toolkit and runtime simplifying the construction of concurrent and distributed applications on the JVM.
|[[Cascading_(software)|Cascading]]||"Abstraction layer for Apache Hadoop and Apache Flink. Cascading is used to create and execute complex data processing workflows on a Hadoop cluster using any JVM-based language.
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|[[Apache_Hadoop|Apache Hadoop]]||Framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models.
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|[[Apache_Spark|Apache Spark]]||Fast and general engine for big data processing, with built-in modules for streaming, SQL, machine learning and graph processing.
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|Apache Crunch||Framework for writing, testing, and running MapReduce pipelines. Its goal is to make pipelines that are composed of many user-defined functions simple to write, easy to test, and efficient to run.
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|[[Apache_Hive|Apache Hive]]||Component of Hortonworks Data Platform(HDP). Hive provides a SQL-like interface to data stored in HDP.
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|DropWizard Jersey||RESTful web services
|[[Jetty_(web_server)|Jetty]]||Java HTTP (Web) server and Java Servlet container.
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|[[Apache_Geronimo|Apache Geronimo]]||Open source server runtime that integrates the best open source projects to create Java/OSGi server runtimes that meet the needs of enterprise developers and system administrators
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|[[Apache_Avalon|Apache Avalon]]||An application server component framework, includes logging, thread pooling, and scheduling.
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|[[ND4J_(software)|ND4J]]||Scientific computing libraries for the JVM.
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|[[Deeplearning4j|Deeplearning4j]]||Open-Source Deep-Learning Software for Java and Scala on Hadoop and Spark.
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|[[Javassist|JavAssist]]||Library providing a means to manipulate the Java bytecode of an application.
|[[Vert.x|Vertx]]||Polyglot event-driven application framework that runs on the Java Virtual Machine.
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|[[JBoss_Seam|JBoss Seam]]||Web application framework developed by JBoss
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|[[Log4j|Apache Log4j]]|| Java logging framework
|Joda Time||Quality replacement for the Java date and time classes.
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|[[PrimeFaces|PrimeFaces]]||User interface (UI) component library for JavaServer Faces (JSF) based applications.
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|[[MyBatis|MyBatis]]||First class persistence framework with support for custom SQL, stored procedures and advanced mappings.
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|[[Apache_Qpid|Apache Qpid]]||Messaging system, implements the Advanced Message Queuing Protocol.
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|[[Google_Guava|Google Guava]]||Set of common libraries, it facilitates best coding practices and helps reduce coding errors. It provides utility methods for collections, caching, primitives support, concurrency, common annotations, string processing, I/O, and validations.
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|[[Gson|Google GSon]]||Library to serialize and deserialize Java objects to (and from) JSON.
|[[Bouncy_Castle_(cryptography)|Bouncy Castle Cryptographic]]||Collection of APIs used in cryptography. It includes APIs for both the Java and the C# programming languages.
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|[[JFreeChart|JFreeChart]]||Java chart library that makes it easy for developers to display professional quality charts in their applications.
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|LogBack||Logging framework, successor to the popular log4j project
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|[[SLF4J|SLF4J]]||Simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction for various logging frameworks.
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|[[Apache_POI|Apache POI]]||APIs for manipulating various file formats based upon Microsoft's OLE 2 Compound Document format.
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|[[Netty_(software)|Netty]]||Netty is a non-blocking I/O (NIO) client-server framework for the development of Java network applications such as protocol servers and clients.
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|[[Apache_Pivot|Apache Pivot]]||Platform for building rich web applications in Java or any JVM-compatible language.
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|[[Google_Guice|Google Guice]]||Lightweight dependency injection framework for Java 6 and above
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|[[Java_APIs_for_Bluetooth|BlueCove]]||Java library for Bluetooth (JSR-82 implementation)
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|[[HSQLDB|HSQLDB]]||RDBMS with JDBC interface, client-server version, query tool, grid, tree, performance test class, servlet, and self-test program.
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|[[TestNG|TestNG]]||JUnit-inspired test framework with extra functionality.
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|[[Play_Framework|Play]]||Play Framework makes it easy to build web applications with Java & Scala. Play is based on a lightweight, stateless, web-friendly architecture.
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|[[Mockito|Mockito]]||Unit testing framework for Java, framework allows the creation of test double objects (mock objects) in automated unit tests for the purpose of Test-driven Development (TDD) or Behavior Driven Development (BDD).
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|[[Vaadin|Vaadin]]||Web framework for rich Internet applications. In contrast to JavaScript libraries and browser-plugin based solutions
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|[[Apache_Shiro|Apache Shiro]]||Powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management.
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|[[JavaServer_Faces|JSF]]||Java specification for building component-based user interfaces for web applications.
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|[[GlassFish|GlassFish]]||Application server and official reference implementation for Servlets 3.0.
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|[[Apache_Felix|Apache Felix]]||Apache Felix is a community effort to implement the OSGi Framework and Service platform and other interesting OSGi-related technologies under the Apache license.
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|Ninja||Full stack web framework for Java.
|OpenCSV||Very simple csv (comma-separated values) parser library for Java.
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|[[Apache_Mesos|Apache Mesos]]||Apache Mesos abstracts CPU, memory, storage, and other compute resources away from machines (physical or virtual), enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
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|[[Jini|Apache River (Jini)]]||Apache River is a project furthering the development and advancement of Jini technology. River is the implementation of Jini service oriented architecture.
| 