GYP (Generate Your Projects), a build automation tool (similar to CMake and Premake) designed to generate native IDE project files (e.g., Visual Studio, Xcode, etc.) from a single configuration
TouchDesigner, a node based visual programming language for real time interactive multimedia content
Tryton, a three-tier high-level general purpose computer application platform
Ubuntu Software Center, a graphical package manager, was installed by default in Ubuntu 9.10, and stopped being included in Ubuntu releases starting with the Ubuntu 16.04 release.
VisTrails, a scientific workflow and provenance management software with visual programming interface and integrated visualization (via Matplotlib, VTK).
Plotly is a scientific plotting library for creating browser-based graphs.
SageMath is a large mathematical software application which integrates the work of nearly 100 free software projects.
SymPy, a symbolic mathematical calculations package
PyMC, python module containing Bayesian statistical models and fitting algorithms, including Markov chain Monte Carlo.
Numerical libraries
NumPy, a BSD-licensed library that adds support for the manipulation of large, multi-dimensional arrays and matrices; it also includes a large collection of high-level mathematical functions. NumPy serves as the backbone for a number of other numerical libraries, notably SciPy. De facto standard for matrix/tensor operations in Python.
Pandas, a library for data manipulation and analysis.
SageMath 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.[12]
SciPy,[13][14][15] a large BSD-licensed library of scientific tools. De facto standard for scientific computations in Python.
ScientificPython, a library with a different set of scientific tools
SymPy, a library based on New BSD license for symbolic computation. Features of Sympy range from basic symbolic arithmetic to calculus, algebra, discrete mathematics and quantum physics.
Additional development packages
Beautiful Soup, a package for parsing HTML and XML documents
Cheetah, a Python-powered template engine and code-generation tool
Construct, a python library for the declarative construction and deconstruction of data structures
Genshi, a template engine for XML-based vocabularies
IPython, a development shell both written in and designed for Python
Jinja, a Python-powered template engine, inspired by Django's template engine
Kid, simple template engine for XML-based vocabularies
Meson build system, a software tool for automating the building (compiling) of software
mod_python, an Apache module allowing direct integration of Python scripts with the Apache web server
PyObjC, a Python to Objective-C bridge that allows writing OS X software in Python
Robot Framework, a generic test automation framework for acceptance testing and acceptance test-driven development (ATDD)
Setuptools, a package development process library designed to facilitate packaging Python projects by enhancing the Python distutils (distribution utilities) standard library.
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
Houdini highly evolved 3D animation package, fully extensible using python
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.[22][non-primary source needed] It is also the development language for OpenMDAO, a framework developed by NASA for solving multidisciplinary design optimization problems.
"Python has been an important part of Google since the beginning, and remains so as the system grows and evolves. Today dozens of Google engineers use Python."[23]
Reddit was originally written in Common Lisp, but was rewritten in Python in 2005[24]
YouTube uses Python "to produce maintainable features in record times, with a minimum of developers"[25]
Enthought uses Python as the main language for many custom applications in Geophysics, Financial applications, Astrophysics, simulations for consumer product companies, ...
Rosneft uses Python as one of the main languages for its geoengineering applications development. RN-GRID, a hydraulic fracturing simulation software, has a graphical user interface written entirely in Python.[26][failed verification]
Pyjs – a framework (based on Google Web Toolkit (GWT) concept) for developing client-side Python-based web applications, including a stand-alone Python-to-JavaScript compiler, an Ajax framework and widget toolkit
PyPy – Python (originally) coded in Python, used with RPython, a restricted subset of Python that is amenable to static analysis and thus a JIT.
Unladen Swallow – performance-orientated implementation based on CPython which natively executed its bytecode via an LLVM-based JIT compiler. Funded by Google, stopped circa 2011
