Byebug is a simple to use, feature rich debugger for Ruby. It uses the TracePoint API for execution control and the Debug Inspector API for call stack navigation, so it doesn't depend on internal core sources. It's developed as a C extension, so it's fast. And it has a full test suite so it's reliable.

Byebug - Debugging in Ruby 2

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. 
<BR><BR>
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

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

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ptpython - A better Python REPL

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Byebug - Debugging in Ruby 2

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ptpython - A better Python REPL

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