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Provides a library of matcher objects (also known as constraints or predicates) allowing 'match' rules to be defined declaratively, to be used in other frameworks. Typical scenarios include testing frameworks, mocking libraries and UI validation rules.

JamVM is an extremely small Java Virtual Machine which conforms to the JVM specification version 2 (blue book). It is designed to support the full specification, and includes support for object finalisation, Soft/Weak/Phantom References, class-unloading, the Java Native Interface (JNI) and the Reflection API.

Jasmin is a Java Assembler Interface. It takes ASCII descriptions for Java classes, written in a simple assembler-like syntax and using the Java Virtual Machine instruction set. It converts them into binary Java class files suitable for loading into a JVM implementation.

Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. It automates the process of checking Java code to spare humans of this boring (but important) task. This makes it ideal for projects that want to enforce a coding standard. Checkstyle can be used as either a commandline utility or as an Ant task.

Subversion is a version control system designed to be as similar to cvs(1) as possible, while fixing many outstanding problems with cvs(1). This port adds Java bindings to Subversion.

BlueJ is an integrated Java environment specifically designed for introductory teaching. BlueJ supports: - fully integrated environment - graphical class structure display - graphical and textual editing - built-in editor, compiler, virtual machine, debugger, etc. - easy-to-use interface, ideal for beginners - interactive object creation - interactive object calls - interactive testing - incremental application development

OpenJDK is an open-source implementation of the Java Platform, Standard Edition. Much of the OpenJDK code is licensed under the GPL version 2 with the Classpath exception. The Java Hotspot virtual machine source code is licensed under the GPL version 2 only.

The Bouncy Castle Crypto APIs consist of the following: . A lightweight cryptography API in Java. . A provider for the JCE and JCA. . A clean room implementation of the JCE 1.2.1. . A library for reading and writing encoded ASN.1 objects. . Generators for Version 1 and Version 3 X.509 certificates, Version 2 CRLs, and PKCS12 files. . Generators for Version 2 X.509 attribute certificates. . Generators/Processors for S/MIME and CMS (PKCS7). . Generators/Processors for OCSP (RFC 2560). . Generators/Processors for TSP (RFC 3161). . Generators/Processors for OpenPGP (RFC 2440). . A signed jar version suitable for JDK 1.4/1.5 and the Sun JCE. It's distributed under a modified X license.

CACAO is a Java Virtual Machine (JVM) which uses Just-In-Time (JIT) compilation to execute Java methods natively.

GNU Classpath, Essential Libraries for Java, is a GNU project to create free core class libraries for use with virtual machines and compilers for the Java programming language.