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Public APIs is a community-curated GitHub repository listing free, publicly accessible APIs across a wide range of categories, with auth type, HTTPS, and CORS noted for each entry. It's a browsable reference, not a library to install.

The System Design Primer is donnemartin's GitHub collection for learning large-scale system design and preparing for the system design interview. It combines topic explainers, a four-step interview framework, worked case studies, and Anki flashcards into one repository with 361,895 stars.

996.ICU is a high-profile GitHub movement with 276,528 stars that protests China's 996 overtime culture—work by 9am, leave at 9pm, six days a week. It provides the Anti-996 License and maintains a company blacklist to advocate for developer labor rights and work-life balance in the tech industry.

Superpowers is an open-source (MIT) skills library and bootstrap instruction set that turns a coding agent's ad-hoc habits into a fixed pipeline: brainstorm a spec, write a plan, build under TDD, review, then close out the branch. Skills trigger automatically once installed, and the same methodology works across eleven different agent harnesses, each requiring its own install step.

torvalds/linux is the GitHub git tree for the Linux kernel's C source code, the hardware-facing layer every Linux distribution builds on top of. Its README sorts documentation by contributor role — developer, security expert, hardware vendor, sysadmin, maintainer, and more — instead of listing kernel features. Stars: 240,417. Forks: 63,461.

Skills For Real Engineers packages Matt Pocock's own agent workflow into roughly 25 slash-command skills covering requirements-gathering, TDD, debugging, and codebase-architecture review. Install the managed Claude Code plugin to track his updates automatically, or pull editable files via skills.sh and fork them. It doesn't automate development for you — it disciplines the AI coding agent you already run.

AutoGPT is an open-source platform for building, deploying, and running AI agents that automate complete workflows. Users can define tasks in plain English using AutoPilot or visually construct steps with the Build interface. The project offers both a managed, hosted platform that handles infrastructure and model access, and a self-hosting option where users provide their own infrastructure and API keys. AutoGPT agents are designed to automate tasks across various domains, including executive operations, sales, and engineering, and integrate with over 45 platforms like Gmail and GitHub. While its `autogpt_platform/` component is licensed under Polyform Shield, the original `classic/` agent and other parts of the project use the MIT License.

yt-dlp is a Python command-line downloader that pulls audio and video from thousands of sites and hands post-processing off to ffmpeg. It's a fork of youtube-dl built for people who want fast fixes when a site breaks, not a polished app.

Ollama is a Go-based CLI and local server for running open large language models — Llama, Gemma, Qwen, DeepSeek, and more — on your own hardware. It wraps the llama.cpp inference engine, exposes a REST API on port 11434, and ships official Python and JavaScript clients so apps can call a local model instead of a hosted one.

MarkItDown is Microsoft's open-source Python library for converting PDF, Office, image, audio, and web files into Markdown, aimed at LLM and RAG pipelines rather than human-facing formatting. It ships as a CLI and a Python API, with optional Azure Document Intelligence and Content Understanding backends for cloud-based extraction of scanned documents and structured fields.

anthropics/skills is Anthropic's public collection of Agent Skills for Claude — SKILL.md folders spanning creative, technical, enterprise, and document tasks, plus a spec and a template for building your own.

prompts.chat is the largest open-source prompt library for AI, formerly called Awesome ChatGPT Prompts. It hosts curated prompts in CSV and Markdown, available as a public website, Hugging Face dataset, or self-hosted instance. The project supports multiple LLM providers including ChatGPT, Claude, Gemini, Llama, and Mistral. Self-hosting uses a Next.js setup wizard that configures authentication via GitHub, Google, or Azure AD, with PostgreSQL as the recommended database. CLI access, an MCP server, and a Claude Code plugin extend its reach into developer workflows. The codebase is MIT-licensed while prompt data falls under CC0. Its 166k GitHub stars make it an AI resource on the platform with 166k GitHub stars, and it has been cited by Harvard, Columbia, and Forbes.

😎 Tracy: the addictive tool to ease debugging PHP code for cool developers. Friendly design, logging, profiler, advanced features like debugging AJAX calls or CLI support. You will love it.

Scripts and samples to support Confluent Demos, Talks, and Blogs. Not all of the examples in this repository are kept up to date. For automated tutorials and QA'd code, see https://github.com/confluentinc/tutorials/

Alpakka Kafka connector - Alpakka is a Reactive Enterprise Integration library for Java and Scala, based on Reactive Streams and Akka.

A training framework for Stable Baselines3 reinforcement learning agents, with hyperparameter optimization and pre-trained agents included.

:atom: Run code interactively, inspect data, and plot. All the power of Jupyter kernels, inside your favorite text editor.

Physics-Informed Neural Networks (PINN) Solvers of (Partial) Differential Equations for Scientific Machine Learning (SciML) accelerated simulation

Multi-language suite for high-performance solvers of differential equations and scientific machine learning (SciML) components. Ordinary differential equations (ODEs), stochastic differential equations (SDEs), delay differential equations (DDEs), differential-algebraic equations (DAEs), and more in Julia.

An asynchronous, persistent key-value store created for writing desktop and mobile applications, based on SQLite3. Akavache is great for both storing important data as well as cached local data that expires.