GNU Classpath provides core class libraries for use with virtual machines and compilers for the java programming language. GNU Classpath 1.0 will be fully compatible with the 1.1 and 1.2 API specifications, in addition to having significant compatibility with the 1.3, 1.4, 1.5 and 1.6 APIs. 

 It is the mother of most of the JVMs. Check out the <A HREF="http://www.gnu.org/software/classpath/stories.html#jvm" target="_blank">list</A> of other Virtual Machine products using GNU Classpath as its base. Intel and IBM are using GNU Classpath in their research

GNU Classpath provides core class libraries for use with virtual machines and compilers for the java programming language. GNU Classpath 1.0 will be fully compatible with the 1.1 and 1.2 API specifications, in addition to having significant compatibility with the 1.3, 1.4, 1.5 and 1.6 APIs.

GNU Classpath - Mother of most of the VM

Quercus is Caucho Technology's 100% Java implementation of PHP 5. Quercus comes with many PHP modules and extensions like PDF, PDO, MySQL, and JSON. Quercus allows for tight integration of Java services with PHP scripts, so using PHP with JMS or Grails is a quick and painless endeavor. With Quercus, PHP applications automatically take advantage of Java application server features just as connection pooling and clustered sessions. Quercus implements PHP 5 and a growing list of PHP extensions including APC, iconv, GD, gettext, JSON, MySQL, Oracle, PDF, and Postgres.PHP code is interpreted/compiled into Java and Quercus and its libraries are written entirely in Java. This helps PHP application to use JMS, EJB, Hibernate, Spring and other frameworks and applications of Java.

Quercus is Caucho Technology's 100% Java implementation of PHP 5. Quercus comes with many PHP modules and extensions like PDF, PDO, MySQL, and JSON. Quercus allows for tight integration of Java services with PHP scripts, so using PHP with JMS or Grails is a quick and painless endeavor. With Quercus, PHP applications automatically take advantage of Java application server features just as connection pooling and clustered sessions.

Quercus - Java implementation of PHP

Kaffe is a clean room implementation of the Java virtual machine, plus the associated class libraries needed to provide a Java runtime environment. It has support for Garbage Collector, Debugging, Profiler, Benchmarking etc. It has been ported to multiple platforms. Among the open source VM, Kaffe is actively developed.

  Kaffe is not an officially licensed version of the Java virtual machine. It contains no Sun source code and was developed without even looking at the Sun source code. Kaffe is a great choice as a base for virtual machine education and research.

Kaffe is a clean room implementation of the Java virtual machine, plus the associated class libraries needed to provide a Java runtime environment. 

Kaffe - Not Java

Kaffe is a great choice as a base for virtual machine education and/or research, or if you need a virtual machine as an integral component of an open source or free software Java distribution. Kaffe is constantly under development, and lacks compatibility in many ways with the current releases of Java. It lacks many key features of a full Java virtual machine implementation - including security related features such as a complete bytecode verifier essential for running untrusted code. Kaffe is not the best Java virtual machine for developing Java applications, as it lacks much in the way of documentation, compatibility, debugging/profiling support, etc. If you are learning Java, or are looking for a complete Java development environment, you will probably be best served by using a "real" Java development environment (such as the JDK) licensed from Sun. Check out our links page for more information.

Kaffe is a clean room implementation of the Java virtual machine, plus the associated class libraries needed to provide a Java runtime environment.

Kaffe

Boxes is a simple GNOME application to view, access, and manage remote and virtual systems. It helps to find your local and remote virtual systems.
 
Boxes is targeted towards a typical desktop end-user who wants either a very safe and easy way to try out new operating systems or new (potentially unstable) versions of her/his favorite operating system(s), or needs to connect to a remote machine (home-office connection being a typical use-case). For this reason, Boxes does not provide many of the advanced options to tweak virtual machines provided by virt-manager. Instead, Boxes focuses on getting things working out of the box with very little input from user.

Boxes is a simple GNOME application to view, access, and manage remote and virtual systems. It helps to find your local and remote virtual systems.







Boxes - Virtualization made simple

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GNU Classpath - Mother of most of the VM

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