bpython is a lightweight Python interpreter that adds several features common to IDEs. These features include syntax highlighting, expected parameter list, auto-indentation, and autocompletion. (See below for example usage).bpython does not aim to be a complete IDE - the focus is on implementing a few ideas in a practical, useful, and lightweight manner.
 
bpython is a great replacement to any occasion where you would normally use the vanilla Python interpreter - testing out solutions to people's problems on IRC, quickly testing a method of doing something without creating a temporary file, etc..

bpython is a lightweight Python interpreter that adds several features common to IDEs. These features include syntax highlighting, expected parameter list, auto-indentation, and autocompletion. bpython does not aim to be a complete IDE - the focus is on implementing a few ideas in a practical, useful, and lightweight manner.

bpython - A fancy curses interface to the Python interactive interpreter

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

Open JDK is the open source implementation of Java platform. It has loads of sub projects like JDK6, JDK7, HotSpot, Graphics, Swing, Web etc. 
 
 <A HREF="http://openjdk.java.net/projects/jdk6/" target="_blank">JDK 6</A> and <A HREF="http://openjdk.java.net/projects/jdk7/" target="_blank">JDK 7</A> projects are based on the specification of Java SE. OpenJDK 6 sources have passed the Java SE 6 Test Compatibility Kit (TCK) suite. <A HREF="http://icedtea.classpath.org/wiki/Main_Page" target="_blank">IcedTea</A> builds the source from Open JDK and adds 64 bit plugin and Java web start etc. 
 
 Open JDK is actively developed and it is compatible with Java specification.

Open JDK is the open source implementation of Java platform. It has loads of sub projects like JDK6, JDK7, HotSpot, Graphics, Swing, Web etc.

Open JDK - Open Source implementation of Java

Java Standard Edition provides Java development kit and Runtime to develop and deploy Java programs. Developed by Sun and take over by Oracle. It has support for different environments like Desktop, Embedded, Web, Realtime etc. 

 Scripting languages framework extends support for Ruby, Python, and other languages. Full JDBC4 implementation providing improved XML support for Databases. It has built-in support for JNI, Reflection, JAAS, JMX and lot more. There could be any other VM but no one could match its features.

Java Standard Edition provides Java development kit and Runtime to develop and deploy Java programs. Developed by Sun and take over by Oracle. It has support for different environments like Desktop, Embedded, Web, Realtime etc.

Java SE - Creator of Java

IPython provides a rich toolkit to help you make the most of using Python interactively. It provides a Jupyter kernel to work with Python code in Jupyter notebooks and other interactive frontends. 
 
IPython’s interactive shell (ipython), has the following goals, amongst others:
<ol>
<li>Provide an interactive shell superior to Python’s default. IPython
has many features for tab-completion, object introspection, system shell
access, command history retrieval across sessions, and its own special
command system for adding functionality when working interactively. It
tries to be a very efficient environment both for Python code development
and for exploration of problems using Python objects (in situations like
data analysis).</li>
<li>Serve as an embeddable, ready to use interpreter for your own
programs. An interactive IPython shell can be started with a single call
from inside another program, providing access to the current namespace.
This can be very useful both for debugging purposes and for situations
where a blend of batch-processing and interactive exploration are needed.</li>
<li>Offer a flexible framework which can be used as the base
environment for working with other systems, with Python as the underlying
bridge language. Specifically scientific environments like Mathematica,
IDL and Matlab inspired its design, but similar ideas can be
useful in many fields.</li>
<li>Allow interactive testing of threaded graphical toolkits. IPython
has support for interactive, non-blocking control of GTK, Qt, WX, GLUT, and
OS X applications via special threading flags. The normal Python
shell can only do this for Tkinter applications.</li>
</ol>

IPython provides a rich toolkit to help you make the most of using Python interactively. It provides a Jupyter kernel to work with Python code in Jupyter notebooks and other interactive frontends. 

IPython - Interactive Computing

A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write. The syntax inspired by Perl with Smalltalk-like features. It was also influenced by Eiffel and Lisp. It is a scripting language that is more powerful than Perl, and more object-oriented than Python.

Ruby - Programming Language

Bhai lang is a toy programming language written in Typescript. hi bhai is the entrypoint for the program and all program must end with bye bhai. Anything outside of it will be ignored.

Bhai Lang- A toy programming language written in Typescript

Apache Harmony is a modular Java runtime with class libraries and associated tools. One of the goals of the Harmony project is to create a design modular enough so that parts of the VM can be implemented in different languages. This project started in 2005 and it is under active development. 

 It adheres to the Java specification. It uses GNU classpath and JCVM a java byte code to C files converter. It has DRLVM, a virtual machine written in C++. It supports JIT compilation, JNI, Garbage Collector and Profile Collector etc.

Apache Harmony is a modular Java runtime with class libraries and associated tools. One of the goals of the Harmony project is to create a design modular enough so that parts of the VM can be implemented in different languages. This project started in 2005 and it is under active development.

Harmony - Open Source Java SE

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

Ptpython is an advanced Python REPL. It should work on all Python versions from 2.6 up to 3.5 and work cross platform (Linux, BSD, OS X and Windows).
<ul>
<li>Syntax highlighting.</li>
<li>Multiline editing (the up arrow works).</li>
<li>Autocompletion.</li>
<li>Mouse support. [1]</li>
<li>Support for color schemes.</li>
<li>Support for <a href="https://cirw.in/blog/bracketed-paste">bracketed paste</a> [2].</li>
<li>Both Vi and Emacs key bindings.</li>
<li>Support for double width (Chinese) characters.</li>
</ul>

Ptpython is an advanced Python REPL. It should work on all Python versions from 2.6 up to 3.5 and work cross platform (Linux, BSD, OS X and Windows).

ptpython - A better Python REPL

JC Virtual machine converts Java class files to C source code. It uses <A HREF="http://www.sable.mcgill.ca/soot/" target="_blank">SOOT</A> Java Bytecode analysis framework to convert the Java files to C. It could also compiles with GCC and loads them with built-in ELF loader. Additional to that, JC provides a complete Java runtime with optimization to increase performance. 

 JC optimizes the code at code generation time which increases its runtime performance. It does have good interpreter but most of the jobs are done at the code generation time. When combined with the proven power of GCC's C optimizer the results are impressive. 

 Additional to C conversion and Java runtime, It has thread support based on the POSIX pthread(3). Support for JNI, Reflection and Java 2 style loader support is also available. It uses <A HREF="http://www.gnu.org/software/classpath/" target="_blank">GNU Classpath</A> to provide java runtime.

JC Virtual machine converts Java class files to C source code. It could also compiles with GCC and loads them with built-in ELF loader. Additional to that, JC provides a complete Java runtime with optimization to increase performance.


JC Virtual Machine - Converts Java to C

cacaovm is a Java Virtual Machine (JVM) which uses Just-In-Time (JIT) compilation to execute Java methods natively. cacaovm uses GNU Classpath or OpenJDK or phoneME as Java runtime library. The cacaovm project started as a research JVM to explore new implementation techniques. The first version for the Alpha was released in February 1997 as a binary. 

 CACAO supports i386, x86_64, Alpha, ARM, MIPS 32/64, PowerPC 32/64, S390 architectures. CACAO is almost fully compliant with the Java Virtual Machine Specification. It has a complete byte code verifier that uses subtype constraints to guarantee type-safety without unnecessary loading. A tailored CACAO can be built by enabling or disabling couple of features to reduce executable size.

cacaovm is a Java Virtual Machine (JVM) which uses Just-In-Time (JIT) compilation to execute Java methods natively. cacaovm uses GNU Classpath or OpenJDK or phoneME as Java runtime library. The cacaovm project started as a research JVM to explore new implementation techniques. The first version for the Alpha was released in February 1997 as a binary.

Cacaovm - Just-In-Time (JIT) Compiler

Stackless Python is an enhanced version of the Python programming language. It allows programmers to reap the benefits of thread-based programming without the performance and complexity problems associated with conventional threads. The most prominent feature of Stackless is microthreads, which avoid much of the overhead associated with usual operating system threads.

Stackless Python - Enhanced version of the Python 

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