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This is a Java port of GNU getopt, a class for parsing command line arguments passed to programs. It is based on the C getopt() functions in glibc 2.0.6 and should parse options in a 100% compatible manner.

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

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.

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.

The IcedTea-Web project provides a Free Software web browser plugin running applets written in the Java programming language and an implementation of Java Web Start, originally based on the NetX project.

An open-source implementation of the Java Platform, Standard Edition,

The Byte Code Engineering Library (formerly known as JavaClass) is intended to give users a convenient possibility to analyze, create, and manipulate (binary) Java class files (those ending with .class). Classes are represented by objects which contain all the symbolic information of the given class: methods, fields and byte code instructions, in particular. Such objects can be read from an existing file, be transformed by a program (e.g. a class loader at run-time) and dumped to a file again. An even more interesting application is the creation of classes from scratch at run-time. The Byte Code Engineering Library (BCEL) may be also useful if you want to learn about the Java Virtual Machine (JVM) and the format of Java .class files. BCEL is already being used successfully in several projects such as compilers, optimizers, obsfuscators and analysis tools, the most popular probably being the Xalan XSLT processor at Apache.

InfoBus enables dynamic exchange of data between JavaBeans(TM) component architecture by defining a small number of interfaces between cooperating Beans and specifying the protocol for use of those interfaces. The protocols are based on a notion of an information bus. All components which implement these interfaces can plug into the bus. As a member of the bus any component can exchange data with any other component in a structured way, including arrays, tables, and database rowsets.

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.

Libvirt-java is a base framework allowing to use libvirt, the virtualization API though the Java programming language.