onlinegdb.com
Online Python Compiler is a developer tool, library, or framework for building, testing, or maintaining software.
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openinterpreter.com
An open-source coding agent built for low-cost and open-weight models.
opensource.guide
Read practical guidance on starting and contributing to open-source projects.
all-hands.dev
OpenHands supports software development with code generation, analysis, debugging, or documentation.
orangedatamining.com
Orange is an open-source machine learning and data visualization toolbox. It offers visual programming in which widgets are placed on a canvas and connected to load datasets and analyze data. It supports interactive visualization methods including box plots, scatter plots, decision trees, hierarchical clustering, heatmaps, MDS, t-SNE and linear projections. Extensions add text mining, network analysis and other specialized capabilities.
noraj.github.io
A project providing Markdown templates for Offensive Security exam reports, covering exams including OSCP, OSWE, OSCE, OSEE and OSWP. It aims to replace LaTeX, Microsoft Office Word and LibreOffice Writer for report writing. Report generation uses a script and requires Pandoc, LaTeX and p7zip. Optional Pandoc Lua filters can be passed.
overapi.com
OverAPI.com is a site that collects all the cheat sheets. It organizes reference sheets for programming languages, frameworks, and developer tools, listing topics from Python and JavaScript to HTML, SQL, and Linux.
pandas.pydata.org
pandas is an open source, BSD-licensed library providing high-performance, easy-to-use data structures and data analysis tools for the Python programming language. It is described as a data analysis and manipulation tool built on top of Python. Documentation, a user guide and an API reference are available.
pastebin.com
Pastebin.com is a paste service that has operated since 2002, described as the number one paste tool. It allows users to store text online for configurable set time periods. The platform offers syntax highlighting for a wide range of programming and markup languages, optional paste settings, category and tag organization for pastes, and provides API tools and an FAQ for users. Some features require user login, and PRO membership is available for additional functionality including Markdown syntax highlighting.
pdfiles.net
PDFiles is a site for downloading PDF ebooks, described as offering many electronic books in Arabic and English, including technical references. It lists English and Arabic book sections, categories such as Android, databases, programming and networks, and a latest books section with titles available to download.
pi.dev
Pi is a terminal-based minimal coding agent harness built to adapt to user workflows rather than requiring users to adjust their processes. It supports 15+ providers and hundreds of models, offers tree-structured shareable interaction history, context engineering features, and four operation modes: interactive, print/JSON, RPC, and SDK. Users can customize Pi with extensions, skills, prompt templates, and themes, and share customizations as packages via npm or git. It is installable via curl, PowerShell, npm, pnpm, or bun.
pieces.app
Pieces is a memory layer that runs in the background on a computer, forming a searchable record of work from apps the user already uses. It captures activity chronologically so users can search, filter and revisit moments, and carry context into AI tools. Memories are saved on-device by default, and capture from copy and paste is opt-in.
pinetools.com
PineTools is a collection of free online tools for common tasks with mathematics, colors, text and lists, numbers, date and time, images, randomness, files and programming. The site also lists video tools described as being for creating, editing, cropping, trimming and merging videos.
playcode.io
PlayCode helps developers write, search, review, test, or manage code and projects.
plugdata.org
plugdata is a free, open-source visual audio programming environment and a modern fork of Pure Data. It offers VST3, AU, CLAP and LV2 plugin export, includes the ELSE and Cyclone libraries, and supports Daisy hardware and code export. It runs as a standalone app, a DAW plugin, or on embedded hardware.
ponytail.dev
Ponytail 5 is a ruleset for AI coding agents intended to make them write the least code that works. It provides a review command and an audit command, and states tests accompany risky logic. The project reports benchmark comparisons against running without it.
predictionguard.com
Prediction Guard is a self-hosted AI control plane described as enforcing NIST and OWASP-aligned runtime controls inside an organization's security boundary. It offers Agent Forge for creating interactive and autonomous agents, and an OpenAI, Anthropic and MCP compatible API. The site lists a Docker Verified Publisher agentic program entry and a verified Agent Control Kit on Docker Hub.
puckeditor.com
Puck helps developers write, search, review, test, or manage code and projects.
pyfunceble.github.io
Pyfunceble helps developers write, search, review, test, or manage code and projects.
pymc.io
Python Library for Probabalistic Programming (Bayesian Inference and Machine Learning).
python.org
Python is a programming language whose official site provides downloads, documentation, a beginner's guide and news. The site lists application areas including web development, GUI development, AI and machine learning, scientific and numeric computing, software development and system administration. The Python Software Foundation supports the language and its community.
nostarch.com
A hands-on, project-based introduction to programming with Python by Eric Matthes, published in its third edition in December 2022. The book covers basic concepts such as variables, lists, classes, and loops, and guides readers through projects including a Space Invaders-inspired arcade game, data visualizations, and a simple web application.
qodo.ai
Qodo supports software development with code generation, analysis, debugging, or documentation.
quickref.me
QuickRef.ME shares quick reference and cheat sheet material for developers, contributed by open source contributors. It covers topics including programming languages, Linux commands, Python, databases, keyboard shortcuts and other toolkits.