PowerMock is a framework that extends other mock libraries such as EasyMock with more powerful capabilities. PowerMock uses a custom classloader and bytecode manipulation to enable mocking of static methods, constructors, final classes and methods, private methods, removal of static initializers and more. By using a custom classloader no changes need to be done to the IDE or continuous integration servers which simplifies adoption.

Although the java.net package provides basic functionality for accessing resources via HTTP, it doesn't provide the full flexibility or functionality needed by many applications. HttpClient seeks to fill this void by providing an efficient, up-to-date, and feature-rich package implementing the client side of the most recent HTTP standards and recommendations.

The JUnitParams project adds a new runner to JUnit and provides much easier and readable parametrised tests for JUnit.

JSON.simple is a small JSON parser and encoder for Java.

Metadata-extractor is a straightforward Java library for reading metadata from image files. It is able to read metadata in Exif, IPTC, XMP, ICC and more formats.

OPS4J stands for Open Participation Software for Java. This package contains utilities and extensions related to java.lang.

This package provides a Java runtime environment for and Java development kit. It supports enhanced class redefinition (DCEVM), includes a number of improvements in font rendering, keyboards support, windowing/focus subsystems, HiDPI, accessibility, and performance, provides better desktop integration and bugfixes not yet present in OpenJDK.

Xbean-reflect provides very flexible ways to create objects and graphs of objects for dependency injection frameworks

JGit is a lightweight, pure Java library implementing the Git version control system, providing repository access routines, support for network protocols, and core version control algorithms.

This package provides the Java development kit OpenJDK.

Modello Java Plugin generates Java objects for the model.

Plexus IO is a set of plexus components, which are designed for use in I/O operations. This implementation using plexus components allows reusing it in maven.

Apache James Mime4J provides a parser, MimeStreamParser, for e-mail message streams in plain rfc822 and MIME format. The parser uses a callback mechanism to report parsing events such as the start of an entity header, the start of a body, etc. If you are familiar with the SAX XML parser interface you should have no problem getting started with mime4j.

This package provides the Java development kit OpenJDK.

OSGi, for Open Services Gateway initiative framework, is a module system and service platform for the Java programming language. This package contains the OSGi org.osgi.service.event module.

ASM is an all purpose Java bytecode manipulation and analysis framework. It can be used to modify existing classes or dynamically generate classes, directly in binary form. The provided common transformations and analysis algorithms allow easily assembling custom complex transformations and code analysis tools.

The Xerces2 Java parser is the reference implementation of XNI, the Xerces Native Interface, and also a fully conforming XML Schema processor.

Xerces2-J supports the following standards and APIs:

• eXtensible Markup Language (XML) 1.0 Second Edition Recommendation

• Namespaces in XML Recommendation

• Document Object Model (DOM) Level 2 Core, Events, and Traversal and Range Recommendations

• Simple API for XML (SAX) 2.0.1 Core and Extension

• Java APIs for XML Processing (JAXP) 1.2.01

• XML Schema 1.0 Structures and Datatypes Recommendations

• Experimental implementation of the Document Object Model (DOM) Level 3 Core and Load/Save Working Drafts

• Provides a partial implementation of the XML Inclusions (XInclude) W3C Candidate Recommendation

Xerces is now able to parse documents written according to the XML 1.1 Candidate Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Candidate Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save API's are in use.

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more!

JUnit is a simple framework to write repeatable tests for Java projects. JUnit provides assertions for testing expected results, test fixtures for sharing common test data, and test runners for running tests.

Plexus-default-container is Plexus' inversion-of-control (IoC) container. It is composed of its public API and its default implementation.

The Plexus project provides a full software stack for creating and executing software projects. Based on the Plexus container, the applications can utilise component-oriented programming to build modular, reusable components that can easily be assembled and reused. This package provides the Maven plugin generating the component metadata.

The Commons Lang components contains a set of Java classes that provide helper methods for standard Java classes, especially those found in the java.lang package in the Sun JDK. The following classes are included:

• StringUtils - Helper for java.lang.String.

• CharSetUtils - Methods for dealing with CharSets, which are sets of characters such as [a-z] and [abcdez].

• RandomStringUtils - Helper for creating randomised strings.

• NumberUtils - Helper for java.lang.Number and its subclasses.

• NumberRange - A range of numbers with an upper and lower bound.

• ObjectUtils - Helper for java.lang.Object.

• SerializationUtils - Helper for serializing objects.

• SystemUtils - Utility class defining the Java system properties.

• NestedException package - A sub-package for the creation of nested exceptions.

• Enum package - A sub-package for the creation of enumerated types.

• Builder package - A sub-package for the creation of equals, hashCode, compareTo and toString methods.

The byte code generation library CGLIB is a high level API to generate and transform Java byte code.

Bnd is a swiss army knife for OSGi, it creates manifest headers based on analyzing the class code, it verifies the project settings, it manages project dependencies, gives diffs jars, and much more.