Libraries & frameworks

Offers a C++ compiler infrastructure and toolchain library for WebAssembly, including an optimizer, parser, and code generation utilities widely adopted as a compilation backend by many language toolchains.

Scalable post-training framework for LLMs focused on reinforcement learning, connecting Megatron training with SGLang rollouts for flexible data generation and large-scale RL workflows.

Open-source Android UI library for rendering PDF documents via Pdfium, featuring animations, gestures, zoom, and double-tap support for easy in-app PDF display.

Microsoft's modern native UI framework for Windows apps, offering Fluent controls and styles for developers.

Open-source toolkit identifying and surgically removing refusal directions from models, offering multiple extraction strategies and inference-time interventions for researchers studying alignment and safety.

Implements a manifold-based nonlinear dimensionality reduction library serving as a faster alternative to t-SNE for visualization and general reduction tasks, integrating seamlessly with the scikit-learn ecosystem.

Supplies a 2D graphics library for HTML5 Canvas with a display list and interaction model, simplifying development of games, advertisements, and data visualization applications for web developers.

Offers an automated machine learning library built on scikit-learn that automatically handles model selection, hyperparameter optimization, and pipeline construction for tabular classification and regression tasks.

A JavaScript library for building beautiful CLI prompts, with opinionated ready-made components plus headless customizable primitives.

Distributed orchestration engine for background jobs and durable workflows, offering queues, retries, scheduled execution and live monitoring with multi-language SDKs and self-hosted deployment.

Serves as the official GitHub SDK for browsers, Node.js, and Deno, integrating REST, GraphQL, App, and Action clients to simplify interaction with GitHub platform APIs.

JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes

Toolkit for building native desktop applications using declarative markup with TypeScript or Zig, compiling to a browser-free runtime for lightweight distribution.

Slide framework designed for AI agents that provides runtime rendering, canvas scaling, and static export, letting agents focus on writing content while the framework handles presentation.

A pure PHP library for programmatically creating and reading Word documents in OOXML, ODF, RTF and HTML formats.

A single-file C audio playback and capture library with mixing, decoding, effects and 3D spatialization, no external dependencies.

A free cross-platform C++ framework for building native-looking advanced GUI applications on Windows, macOS and Linux.

Research-oriented machine-learning implementation exploring neural-network training on Apple's Neural Engine through reverse-engineered private APIs, including forward and backward passes for experimenters.

Python subprocess replacement library allowing any system program to be invoked like a function, relying on Unix system calls and supporting Unix-like systems only.

High-performance list component for React Native that serves as a drop-in FlatList replacement, supporting dynamic item sizes and masonry layouts for smooth scrolling.

Cross-platform WebView component for React Native that embeds web content display on iOS, Android, Windows and other supported mobile targets.

Full-stack research codebase for engineers studying speculative decoding, covering dataset preparation, draft-model training scripts, multi-benchmark evaluation harnesses, and released model weights.

➷ A robust Javascript library for capturing keyboard input. It has no dependencies.

Fine-tuning tool that configures LLM post-training from a single YAML file and command. Using layer streaming, it enables developers to train 8B models on 4GB laptop GPUs with limited memory.

TypeScript library built on Playwright that uses multiple LLMs to extract any webpage into structured data validated against Zod schemas.

Serves as a 3D physics engine for games, offering continuous collision detection, rigid-body solving, and multiple physics systems with multi-platform builds for game developers.

Open-source enterprise integration framework with over 350 connectors, letting developers write routes in Java, YAML, or XML to connect databases, message queues, APIs, and cloud services.

A high-performance Java library for reading and writing huge spreadsheets with low memory via streaming APIs.

A Python library for automating Windows GUIs, driving windows, controls, mouse, and keyboard in code.

A pure-Rust library for cross-platform window creation and event handling in graphics apps.

A CRDT library that makes JSON data collaborative and version-controlled for building local-first collaborative apps.

A high-performance networking framework of TCP, UDP, and HTTP components for concurrent servers.

A toolkit and component library for building block-based editors and collaborative web applications.

A JavaScript library for generating and tweaking Word .docx files in Node.js and browsers with a declarative API.

An event-driven workflow orchestration platform for building reliable durable step functions, background jobs, and AI workflows in code.

The framework for building with WebAssembly (wasm). Easily & securely load wasm modules, move data, call functions, and build extensible apps.

a browser detector

A mighty tiny Java framework for building rich, user-friendly command-line apps with subcommands, colors, and autocompletion.

Local-first healthcare development kit for clinical named-entity recognition and HIPAA-oriented PII de-identification, packaging over 1,000 on-device medical models across 12 languages with MLX and Python support.

Scalable reinforcement learning infrastructure for embodied and agentic AI, supporting large-scale fine-tuning, standardized evaluation and reproducible training workflows for robotics researchers.

An emulation framework for Android native libraries with experimental iOS support, handling instruction execution, syscalls, hooking, and debugging for reverse-engineering and security research.

A tiny reactive data store and sync engine for building fast local-first apps with queries and UI bindings.

A zero-config framework for building cross-browser extensions with hot reload, TypeScript support and one-command store-ready builds.

A Python library that repairs malformed JSON from LLMs and APIs, acting as a drop-in fallback for json.loads with schema guidance.

Batteries-included framework for building web applications in Rust, providing routing, components, and server-side rendering for complete full-stack development aimed at web developers.

A .NET library for running command-line processes with fluent configuration, piping, async execution and cancellation support.

Ruby ♥︎ JavaScript

A tiny JavaScript library that uses service workers to keep websites accessible with cached content when offline.

A header-only C++ networking library built on Boost.Asio, providing low-level HTTP and WebSocket primitives for clients and servers.

Chromium Embedded Framework (CEF). A simple framework for embedding Chromium-based browsers in other applications.

A developer SDK implementing the AirPlay mirroring and casting protocol for building receivers and transmitters across Linux, Android, and Windows.

Undetected version of the Playwright testing and automation library.

A JavaScript implementation of a web browser without its graphical user interface

Collision is a PHP library that brings beautiful readable error reports to CLI apps, bundled with Laravel and supporting Symfony and PHPUnit.

React component library inspired by Animal Crossing interfaces, offering a cute island-style design language with custom visuals, animations, icons, and layouts.

Microsoft's .NET framework for building and editing Word, Excel and PowerPoint files at the Open XML level.

Chrome Debugging Protocol interface for Node.js

A Vite-powered React framework that lets you build web and React Native apps from one codebase with unified routing.

A durable execution runtime for resilient apps, offering workflows, microservice orchestration, and event processing via multi-language SDKs.

An open-source 3D C++ game engine with an editor and data-oriented architecture for building cross-platform games.

Offers a modern spreadsheet engine written in Rust for developers, providing core calculation, formatting, and file read-write capabilities for integration across multiple programming languages.

Delivers GB-per-second language model tokenization compatible with popular tokenizers, designed for high-throughput preprocessing and inference pipelines for researchers and engineers needing fast text encoding at scale.

Provides a scalable open-source machine learning library for researchers and engineers working on distributed training, model serving, federated learning, and cross-cloud GPU scheduling.

Runs a local-first self-contained workflow engine where small teams define DAGs in declarative YAML, with scheduling, retries, AI-agent management, and a web UI requiring no external database.

An AirPlay mirroring and casting SDK for building receivers and senders across Android, Windows, and Linux with low-latency 4K support.

A PHP micro-framework for building console applications on Laravel components, with scheduling, menus, notifications, and single-binary builds.

JavaScript library to zip and unzip files supporting parallel compression, web streams, pluggable compression engines, zip64, split files, data encryption, and deflate64 decompression.

Cloudflare's accessible React component library built on Base UI, providing reusable primitives and design-system tooling for developers building modern web applications.

An open-source 3D C++ game engine with an editor and data-oriented architecture for building cross-platform games.

Lightweight component-based rule engine using a distinctive DSL to orchestrate business logic, supporting component reuse, synchronous and asynchronous execution, dynamic and nested rules, multi-language scripting, and hot deployment.

Python library for collaborative filtering on implicit-feedback datasets, implementing parallelized models such as ALS to train efficiently and generate personalized recommendations.

An open framework for researching and training foundation models, from data curation to evaluation.

A Flutter plugin that allows you to add an inline webview, to use a headless webview, and to open an in-app browser window.

A type-safe Swift library for parsing command-line arguments, for building CLIs with automatic help and validation.

A central repository plus CLI of high-quality Flow library definitions for typing third-party JavaScript dependencies.

A next-generation state management framework with reactive SQLite and built-in sync for offline-first apps.

A zero-dependency Node.js library that helps build CLI apps with argument parsing, help and version handling.

A Go library for rendering Markdown with stylesheets on ANSI terminals, used by CLI apps like Glow.

A premium React Native audio library with background playback, caching, preloading, and native media controls.

The Gosub browser engine

Open-source framework for rapidly building AI-native IDE products, providing core IDE components, customization capabilities, and MCP client support for desktop and cloud development environments.

NVIDIA codebase for humanoid whole-body control, providing decoupled WBC controllers with GR00T N1.5, N1.6, and SONIC weights plus training, evaluation, and deployment scripts.

A JavaScript templating library that turns Word, PowerPoint and Excel templates into finished reports from JSON data.

A Python wrapper for Microsoft UI Automation for scripting and testing Windows desktop GUI applications.

EventEmitter3 - Because there's also a number 2. And we're faster.

EAF, an extensible framework that revolutionizes the graphical capabilities of Emacs

A Flutter package implementing Microsoft Fluent UI widgets for building native-looking Windows apps with Dart.

A Kotlin data-loading library that unifies network, disk, and memory sources with caching and reactive streams.

Minimal prebuilt OpenCV binaries and source for Android, iOS, ARM Linux, desktop, and WebAssembly development.

Interactive 3D human anatomy explorer built with Three.js, providing developers a starter scaffold and visualization dependencies for building anatomical interaction experiences.

Open-source WebGPU-based charting library for developers visualizing millions of data points with real-time streaming, efficient rendering, and multi-chart shared-device support.

A production-oriented SwiftUI component library with full-stack recipes and sample code. It connects through MCP to help developers quickly build and ship native iOS applications.

A modern cross-platform port of Turbo Vision, a C++ framework library for building rich text-based user interfaces with Unicode support.

A runtime code manipulation system and instrumentation framework for building dynamic program analysis, profiling, and debugging tools.

A lightweight typed reactive data library for ambitious web apps, syncing API data with best-in-class performance across frameworks.

A delightful toolkit for building Node-based command line apps in TypeScript.

A multiplatform C++ library for capturing, parsing, and crafting network packets with wrappers for libpcap, DPDK, and more.

A fast pure-JavaScript library to validate, parse, and build XML without native bindings.

A super lightweight JavaScript framework for building command line applications.

A lightweight Go package for rendering ASCII line charts in terminal apps.