Python

Hug

Hug is an open-source Python framework for building APIs. It aims to make API development simple and fast, emphasizing the use of intuitive and expressive code.

Jam.py

Jam.py is a free, open-source, and event-driven framework for building web and mobile database applications in Python. 

Jinja2

A template engine for Python. It offers a powerful set of tools, including sandbox environment, automatic HTML escaping system, a debugger, template inheritance, designer helpers and configurable syntax. It also provides full unicode support.

Jupyter (IPython)

Web application that allows to create and share documents that contain live code, equations, visualizations and narrative text. Uses include: data cleaning and transformation, numerical simulation, statistical modeling, data visualization, machine learning, and much more.

Kivy

Python library for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps. Used for making mobile apps with python. It can run on Android, iOS, Linux, OS X, and Windows.

Lettuce

Lettuce is an open-source Python framework for behavior-driven development (BDD). It allows developers to define and run BDD tests using plain text feature files and step definitions written in Python.

Masonite

Masonite is an open-source Python web framework that aims to make web application development simple and accessible. It provides a well-structured and extensible platform for building web applications, emphasizing clean code and developer-friendly features.

matplotlib

Python 2D plotting library which produces publication quality figures in a variety of hardcopy formats and interactive environments across platforms. Matplotlib can be used in Python scripts, the Python and IPython shell, the jupyter notebook, web application servers, and four graphical user interface toolkits.

MicroPython

MicroPython is a lean and efficient implementation of the Python 3 programming language designed to run on microcontrollers and small embedded systems. It allows developers to write and run Python code on resource-constrained devices.

MorePath

MorePath is an open-source Python web microframework that focuses on creating RESTful web applications. It provides a straightforward way to design and implement web applications with RESTful principles in mind.

OpenRemote

OpenRemote is an open-source platform for home automation and IoT projects. It allows users to create custom automation and control solutions for various devices and systems using Python and other programming languages. OpenRemote provides a flexible and customizable framework for designing and managing smart home and IoT applications.

PEPs

PEPs, or Python Enhancement Proposals, are design documents that describe proposed new features, enhancements, or processes for the Python programming language. They provide a structured way for the Python community to discuss and reach a consensus on language changes.

Pipenv

A tool that aims to bring the best of all packaging worlds (bundler, composer, npm, cargo, yarn, etc.) to the Python world.

Plotly

Plotly is an open-source data visualization library that provides a wide range of chart types and interactive graphs for creating data-driven visualizations. It can be used with various programming languages, including Python, JavaScript, and R, making it a versatile tool for creating charts and dashboards.

PyBrain

Modular Machine Learning Library for Python. Its goal is to offer flexible, easy-to-use yet still powerful algorithms for Machine Learning Tasks and a variety of predefined environments to test and compare your algorithms.

PyCharm

Integrated Development Environment (IDE) used in computer programming, specifically for the Python language. It provides code analysis, a graphical debugger, an integrated unit tester, integration with version control systems (VCSes), and supports web development with Django.

Pycnic

Pycnic is a Python web framework for building web applications and RESTful APIs. Pycnic provides tools and utilities for routing, handling requests, and responding with JSON data, simplifying the development of web-based applications. 

pygame

Pygame is a popular open-source Python library used for developing 2D games and multimedia applications. It simplifies the process of creating games by providing a set of functions for handling graphics, sound, and user input.

pyglet

Pyglet is a Python library for creating games and multimedia applications, similar to pygame. It provides support for handling graphics, audio, and user input, making it suitable for 2D game development and multimedia projects.

PyGTK

A set of wrappers written in Python and C for GTK + GUI library. It is part of the GNOME project. It offers comprehensive tools for building desktop applications in Python.

PyGUI

PyGUI is a framework for developing graphical user interfaces (GUIs) in the Python programming language. It provides tools and libraries that enable developers to create and manage user interfaces for desktop apps. PyGUI simplifies the process of creating cross-platform graphical applications by abstracting many of the complexities associated with GUI development, making it easier to build applications that work on different operating systems.

Pylons

Application framework for the Web, written in Python. It makes great utilization of the Web Server Gateway Interface standard to support reusability and to divide functionality into different modules.

Pyodide

Pyodide is an open-source project that brings the Python programming language to the web browser. It allows users to run Python code directly in a web page, making it useful for data science, scientific computing, and interactive web applications.

Pyomo

Pyomo is an open-source Python library for modeling and solving mathematical optimization problems. It provides a high-level, algebraic approach to specifying and solving complex optimization problems.

Pyparsing

A recursive descent parser framework for the Python programming language. Alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions.