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.<BR><BR>

 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

The Xen hypervisor is a layer of software running directly on computer hardware replacing the operating system thereby allowing the computer hardware to run multiple guest operating systems concurrently. It suppors x86, x86-64, Itanium, Power PC, and ARM processors allow the Xen hypervisor to run on a wide variety of computing devices.<BR><BR>With Xen virtualization, a thin software layer known as the Xen hypervisor is inserted between the server's hardware and the operating system. This provides an abstraction layer that allows each physical server to run one or more "virtual servers", effectively decoupling the operating system and its applications from the underlying physical server.

The Xen hypervisor is a layer of software running directly on computer hardware replacing the operating system thereby allowing the computer hardware to run multiple guest operating systems concurrently. It suppors x86, x86-64, Itanium, Power PC, and ARM processors allow the Xen hypervisor to run on a wide variety of computing devices.

Xen - Open Source Virtualization

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

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