World made with Python

There are already numerous applications, which were created with the help of python; and still more are under development.
Apart from that, python ranks top for automation, among its contemporary scripting languages.

Software make with python

Applications:

1.      Anki, a spaced repetition flashcard program

2.      Bazaar, a free distributed revision control system

3.      BitTorrent, original client, along with several derivatives

4.      Blender 3D (software), 3D art and animation program with a game engine. Allows for Python scripting in the game engine and in modelling and animation.

5.      BuildBot, a continuous integration system

6.      Calibre, an open source e-book management tool

7.      Chandler, a personal information manager including calendar, email, tasks and notes support that is not currently under development

8.      Cinema 4D, a 3D art and animation program for creating intros and 3-Dimensional text. Has a built in Python scripting console and engine.

9.      Deluge, a BitTorrent client for GNOME

10.  Dropbox, a web-based file hosting service

11.  emesene, a MSN/WLM substitute

12.  EventGhost, Free and open-source automation tool for Windows.

13.  Exaile, an open source audio player

14.  Gajim, an instant messaging client for the XMPP protocol

15.  GlobaLeaks, an open-source whistleblowing framework

16.  GRAMPS, an open source genealogy software

17.  Gwibber, a microblogging client

18.  Getting Things Gnome!, a to-do list manager for Gnome environment based on Getting Things Done philosophy

19.  Hexinator, a modeling tool for binary files. Uses Python for implementation of custom data types, extended parsing logic and other tasks.

20.  Image Packaging System, an advanced, cross-platform package management system primarily used in the Solaris operating system and OpenSolaris derivatives

21.  Juice, a popular podcast downloader

22.  Mercurial a cross-platform, distributed source management tool

23.  Miro, a cross-platform internet television application

24.  Morpheus, file-sharing client/server software operated by the company StreamCast

25.  MusicBrainz Picard, a cross-platform MusicBrainz tag editor

26.  Nicotine, a PyGTK Soulseek client

27.  OpenLP, lyrics projection software

28.  OpenShot Video Editor

29.  OpenStack, a cloud computing IaaS platform

30.  Pip, a package manager used to install and manage Python software packages such as those from the Python Package Index (PyPI) software repository

31.  PiTiVi, a non-linear video editor

32.  Portage, the heart of Gentoo Linux, an advanced package management system based on the BSD-style ports system

33.  Quake Army Knife, an environment for developing 3D maps for games based on the Quake engine

34.  Quod Libet, a cross-platform free and open source music player, tag editor and library organizer

35.  Resolver One, a spreadsheet

36.  RhodeCode, a python based source code management for Git, SVN and Mercurial repositories

37.  SABnzbd, A Usenet binaries downloader

38.  Sage (sagemath) combines more than 20 main opensource math packages and provides easy to use web interface with the help of Python

39.  SCons, a tool for building software

40.  SpecScripter, screenwriting, story building and screenplay analyzing/critiquing software

41.  Stellar, a crossplatform python game engine inspired by Game Maker

42.  Tryton, a three-tier high-level general purpose computer application platform

43.  Ubuntu Software Center, a graphical package manager, installed by default in Ubuntu 9.10 and higher

44.  Wammu, a mobile phone management utility

45.  Wicd, a network manager for Linux

46.  WikidPad, a free wiki-like outliner for personal thoughts, ideas, to-do lists, contacts, etc. with wiki-like linking between pages.

47.  YUM, a package management utility for RPM-compatible Linux operating systems

48.  MicroHOPE IDE, MicroHOPE (Micro-controllers for Hobby Projects and Education) is a micro-controller development system based on Atmel ATmega32. Developed by IUAC, New Delhi, and released as open hardware. Its IDE is written in Python.

Web Applications:

1.      ERP5, a powerful open source ERP / CRM used in Aerospace, Apparel, Banking and for e-government

2.      Gate One, an open source terminal emulator and SSH client

3.      GNU Mailman, one of the more popular packages for running email mailing lists

4.      MoinMoin, a wiki engine

5.      OpenERP, new name Odoo, an open source comprehensive suite of business applications

6.      Planet, a feed aggregator

7.      Plone, an open source content management system

8.      Pyrat is a Laboratory Animal Facility Management Software (or Lab Animal Colony Management Software) written in Python. Its name means "Python based Relational Animal Tracking"

9.      Roundup, a bug tracking system

10.  Tor2web, an HTTP proxy for Tor Hidden Services (HS)

11.  Trac, web-based bug/issue tracking database, wiki, and version control front-end

12.  Turntable.fm, a discontinued social media site for interactively sharing music

13.  ViewVC, a web-based interface for browsing CVS and SVN repositories.

14.  Instagram

15.  Pinterest

16.  Disqus

17.  Bitbucket

18.  Mozilla

.........and many any more !

Video games:

1.      Bridge Commander

2.      Civilization IV uses Python for most of its tasks

3.      Disney's Toontown Online is written in Python and uses Panda3D for graphics.

4.      Battlefield 2 uses Python for all of its addons and a lot of its functionality

5.      Eve Online uses Stackless Python

6.      Freedom Force

7.      Frets on Fire is written in Python and uses Pygame

8.      The Temple of Elemental Evil, a computer role-playing game based on the classic Greyhawk Dungeons & Dragons campaign setting

9.      Unity of Command (video game) is an operational-level wargame about the 1942/43 Stalingrad Campaign on the Eastern Front.

10.  Vampire: The Masquerade – Bloodlines, a computer role-playing game based on the World of Darkness campaign setting

11.  Vega Strike, an open source space simulator, uses Python for internal scripting

12.  World of Tanks uses Python for most of its tasks

.........

Web Frame Works: Python has the most number of rapid development Web frameworks out there . You can create a fully functional blog in literally 10 minutes! .

1.      CherryPy, an object-oriented web application server and framework

2.      Django, an MVC (model, view, controller) web framework

3.      Bottle, A fast, simple and lightweight WSGI micro web framework

4.      Flask, a modern, lightweight, well-documented microframework based on Werkzeug and Jinja 2

5.      Google App Engine, a platform for developing and hosting web applications in Google-managed data centers, including Python.

6.      Pylons, a lightweight web framework emphasizing flexibility and rapid development

7.      Pyramid, is a minimalistic web framework inspired by Zope, Pylons and Django

8.      Quixote, a framework for developing Web applications in Python

9.      Topsite Templating System, another Python-powered web framework

10.  TurboGears, a web framework combining SQLObject/SQLAlchemy, Kid/Genshi, and CherryPy/Pylons

11.  web2py, a full-stack enterprise web application framework, following the MVC design

12.  Zope, an application server, commonly used to build content management systems

13.  Tornado, a lightweight non-blocking server and framework

........

Graphics frameworks:

1.      Pygame, Python bindings for SDL

2.      Panda3D, a 3D game engine for Python

3.      Python Imaging Library, a module for working with images

4.      Python-Ogre, a Python Language binding for the OGRE 3D engine

5.      Soya3D, a high-level 3D game engine for Python

.......

UI frameworks:

1.      Kivy, open source Python library for developing multitouch application software with a natural user interface (NUI).

2.      PyGTK, a popular cross-platform GUI library based on GTK+; furthermore, other GNOME libraries also have bindings for Python

3.      PyQt, another cross-platform GUI library based on Qt; as above, KDE libraries also have bindings

4.      PySide, an alternative to the PyQt library, released under the BSD-style licence

5.      Tkinter is Python's de facto GUI it is shipped in most versions of Python and is integrated in the IDLE. It is based Tcl command tool.

6.      wxPython, a port of wxWidgets and a cross-platform GUI library for Python

Scientific packages:

1.      Astropy, a library of Python tools for astronomy and astrophysics.

2.      Biopython, a Python molecular biology suite

3.      graph-tool, a Python module for manipulation and statistical analysis of graphs.

4.      Pathomx, a workflow-based metabolomics analysis tool.

5.      NetworkX, a package for the creation, manipulation, and study of complex networks.

6.      SciPy, a library of scientific and numerical routines

7.      scikit-learn, a library for machine learning.

8.      scikit-image, a library for image processing.

9.      SymPy, a symbolic calculation package

10.  TomoPy, a package for tomographic data processing and image reconstruction

11.  Veusz, a scientific plotting package

12.  VisTrails, a scientific workflow and provenance management software with visual programming interface and integrated visualization (via Matplotlib, VTK).

Mathematical libraries:

1.      Matplotlib, an extension providing MATLAB-like plotting and mathematical functions

2.      Plotly is a scientific plotting library for creating browser-based graphs.

3.      NumPy, a language extension that adds support for large and fast, multi-dimensional arrays and matrices

4.      Sage is a large mathematical software application which integrates the work of nearly 100 free software projects and supports linear algebra, combinatorics, numerical mathematics, calculus, and more.

5.      SymPy, a symbolic mathematical calculations package.

....

Additional development packages:

1.      Cheetah, a Python-powered template engine and code-generation tool

2.      Construct, a python library for the declarative construction and deconstruction of data structures

3.      IPython, a development shell both written in and designed for Python

4.      Jinja, a Python-powered template engine, inspired by Django's template engine

5.      mod python, an Apache module allowing direct integration of Python scripts with the Apache web server

6.      PYthon Remote Objects, a Distributed Object Technology

7.      PyObjC, a Python to Objective-C bridge that allows writing Mac OS X software in Python

8.      Setuptools, a package development process library designed to facilitate packaging Python projects by enhancing the Python distutils (distribution utilities) standard library.

9.      Sphinx (documentation generator), which converts reStructuredText files into HTML websites and other formats including PDF, EPub and Man pages

10.  Twisted, a networking framework for Python

11.  VPython, the Python programming language plus a 3D graphics module called Visual

Embedded as a scripting language: Python is, or can be used as the scripting language in these software products.

1.      Abaqus (Finite Element Software)

2.      ADvantage Framework

3.      Amarok

4.      ArcGIS, a prominent GIS platform, allows extensive modelling using Python

5.      Autodesk Maya, professional 3D modeler allows Python scripting as an alternative to MEL as of version 8.5

6.      Autodesk MotionBuilder

7.      Autodesk Softimage (formerly Softimage|XSI)

8.      BioNumerics a bioinformatics software suite for the management, storage and (statistical) analysis of all types of biological data.

9.      Blender

10.  Boxee, a cross-platform home theater PC software

11.  Cinema 4D

12.  Corel Paint Shop Pro

13.  Claws Mail with Python plugin

14.  Cyme, an Electrical Power engineering software

15.  DSHub

16.  Editorial, a commercial text editor for iOS

17.  ERDAS Imagine

18.  EventScripts, plugin for Valve's Source engine

19.  FreeCAD

20.  gedit

21.  GIMP

22.  GNAT The GNAT programming chain tool (Ada language implementation in GNU gcc), as a GNATcoll reusable components for the applications (with or without PyGTK) and as a scripting language for the commands in the GPS programming environment

23.  Houdini highly evolved 3D animation package, fully extensible using python

24.  Inkscape, a free vector graphics editor

25.  MeVisLab, a medical image processing and visualization software, uses Python for network scripting, macro modules, and application building

26.  Modo

27.  Micromine

28.  Minecraft: Pi Edition (game)

29.  MSC.Software's CAE packages: Adams, Mentat, SimXpert

30.  MySQL Workbench, a visual database design tool

31.  Notepad++ has a plugin named PythonScript that allows scripting Notepad++ in Python

32.  Nuke (compositing for visual effects)

33.  ParaView, an opensource scientific visualization software

34.  Poser, a 3D rendering and animation computer program that uses for scripting a special dialect of Python, called PoserPython

35.  PyMOL, a popular molecular viewer that embeds Python for scripting and integration

36.  QGIS uses Python for scripting and plugin-development

37.  Rhinoceros 3D version 5.0

38.  Rhythmbox

39.  Scribus

40.  3DSlicer, medical image visualisation and analysis software. Python is available for algorithm implementation, analysis pipelines, and GUI creation.

41.  SPSS statistical software SPSS Programmability Extension allows users to extend the SPSS command syntax language with Python

42.  Totem, a media player for the GNOME desktop environment

43.  Vim

44.  VisIt

45.  WeeChat, a console IRC client

Commercial uses:

1.      CCP hf uses Stackless Python in both its server and client side applications for its MMO Eve Online

2.      NASA is using Python to implement a CAD/CAE/PDM repository and model management, integration, and transformation system which will be the core infrastructure for its next-generation collaborative engineering environment. It is also the development language for OpenMDAO, a framework developed by NASA for solving multidisciplinary design optimization problems.

3.      Google uses heavily using python for various of its applications

4.      Reddit was originally written in Common Lisp, but was rewritten in Python in 2005

5.      Yahoo! Groups uses Python "to maintain its discussion groups"

6.      YouTube uses Python "to produce maintainable features in record times, with a minimum of developers"

7.      Enthought uses python as the main language for countless custom applications in Geophysics, Financial applications, Astrophysics, simulations for consumer product companies, ...

8.      EDF uses Python for their finite element solver Code Aster in combination with Fortran

Python Implementation variants:

1.      ActivePython, the Python implementation from ActiveState, includes a Windows Script Host scripting engine called PythonScript. Scripts written in PythonScript have the default file name extension of .pys.

2.      CPython - the reference implementation, written in C89.

3.      CLPython - implementation, written in Common Lisp

4.      Cython is a programming language to simplify writing C and C++ extension modules for the CPython Python runtime.

5.      IronPython - Python for .NET and Mono platforms

6.      Jython - Python coded in Java

7.      Parrot - virtual machine being developed mainly as the runtime for Perl 6, but with the intent to also support dynamic languages like Python, Ruby, Tcl, etc.

8.      Psyco - not an implementation, but JIT compiler for CPython

9.      PyPy - Python (originally) coded in Python, used in conjunction RPython, a restricted subset of Python that is amenable to static analysis and therefore a JIT.

10.  Stackless Python - Python with coroutines

11.  Unladen Swallow - the Python implementation from the Google team

12.  Nuitka - Python to C++ compiler.

 .....

Note;

Rarely one could find a programming language with so much of diversity and used in so many scientific and non scientific fields.

Being open-source, python has very large community base. The community of Python users is where lies its "undying" spirit .

Reference:
1. Wikipedia
2. Quora.com