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react
The library for web and native user interfaces.react-native
A framework for building native applications using Reactcreate-react-app
Set up a modern web app by running one command.docusaurus
Easy to maintain open source documentation websites.jest
Delightful JavaScript Testing.rocksdb
A library that provides an embeddable, persistent key-value store for fast storage.folly
An open-source C++ library developed and used at Facebook.zstd
Zstandard - Fast real-time compression algorithmflow
Adds static typing to JavaScript to improve developer productivity and code quality.lexical
Lexical is an extensible text editor framework that provides excellent reliability, accessibility and performance.relay
Relay is a JavaScript framework for building data-driven React applications.hhvm
A virtual machine for executing programs written in Hack.prophet
Tool for producing high quality forecasts for time series data that has multiple seasonality with linear or non-linear growth.fresco
An Android library for managing images and the memory they use.yoga
Yoga is an embeddable layout engine targeting web standards.infer
A static analyzer for Java, C, C++, and Objective-Cflipper
A desktop debugging platform for mobile developers.watchman
Watches files and records, or triggers actions, when they change.react-devtools
An extension that allows inspection of React component hierarchy in the Chrome and Firefox Developer Tools.hermes
A JavaScript engine optimized for running React Native.jscodeshift
A JavaScript codemod toolkit.chisel
Chisel is a collection of LLDB commands to assist debugging iOS apps.buck
A fast build system that encourages the creation of small, reusable modules over a variety of platforms and languages.stylex
StyleX is the styling system for ambitious user interfaces.proxygen
A collection of C++ HTTP libraries including an easy to use HTTP server.facebook-ios-sdk
Used to integrate the Facebook Platform with your iOS & tvOS apps.litho
A declarative framework for building efficient UIs on Android.pyre-check
Performant type-checking for python.facebook-android-sdk
Used to integrate Android apps with Facebook Platform.redex
A bytecode optimizer for Android appssapling
A Scalable, User-Friendly Source Control System.componentkit
A React-inspired view framework for iOS.fishhook
A library that enables dynamically rebinding symbols in Mach-O binaries running on iOS.PathPicker
PathPicker accepts a wide range of input -- output from git commands, grep results, searches -- pretty much anything. After parsing the input, PathPicker presents you with a nice UI to select which files you're interested in. After that you can open them in your favorite editor or execute arbitrary commands.metro
🚇 The JavaScript bundler for React Nativeprop-types
Runtime type checking for React props and similar objectsidb
idb is a flexible command line interface for automating iOS simulators and devicesHaxl
A Haskell library that simplifies access to remote data, such as databases or web-based services.FBRetainCycleDetector
iOS library to help detecting retain cycles in runtime.memlab
A framework for finding JavaScript memory leaks and analyzing heap snapshotsduckling
Language, engine, and tooling for expressing, testing, and evaluating composable language rules on input strings.fbt
A JavaScript Internationalization Frameworkregenerator
Source transformer enabling ECMAScript 6 generator functions in JavaScript-of-today.buck2
Build system, successor to Buckmcrouter
Mcrouter is a memcached protocol router for scaling memcached deployments.wangle
Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.wdt
Warp speed Data Transfer (WDT) is an embeddedable library (and command line tool) aiming to transfer data between 2 systems as fast as possible over multiple TCP paths.igl
Intermediate Graphics Library (IGL) is a cross-platform library that commands the GPU. It provides a single low-level cross-platform interface on top of various graphics APIs (e.g. OpenGL, Metal and Vulkan).fbthrift
Facebook's branch of Apache Thrift, including a new C++ server.mysql-5.6
Facebook's branch of the Oracle MySQL database. This includes MyRocks.Ax
Adaptive Experimentation Platformfbjs
A collection of utility libraries used by other Meta JS projects.jsx
The JSX specification is a XML-like syntax extension to ECMAScript.react-native-website
The React Native website and docsscreenshot-tests-for-android
Generate fast deterministic screenshots during Android instrumentation testsidx
Library for accessing arbitrarily nested, possibly nullable properties on a JavaScript object.TextLayoutBuilder
An Android library that allows you to build text layouts more easily.mvfst
An implementation of the QUIC transport protocol.SoLoader
Native code loader for Androidfacebook-python-business-sdk
Python SDK for Meta Marketing APIsThreatExchange
Trust & Safety tools for working together to fight digital harms.CacheLib
Pluggable in-process caching engine to build and scale high performance servicesmariana-trench
A security focused static analysis tool for Android and Java applications.fatal
Fatal is a library for fast prototyping software in modern C++. It provides facilities to enhance the expressive power of C++. The library is heavily based on template meta-programming, while keeping the complexity under-the-hood.transform360
Transform360 is an equirectangular to cubemap transform for 360 video.openr
Distributed platform for building autonomic network functions.fboss
Facebook Open Switching System Software for controlling network switches.ktfmt
A program that reformats Kotlin source code to comply with the common community standard for Kotlin code conventions.facebook-php-business-sdk
PHP SDK for Meta Marketing APIwinterfell
A STARK prover and verifier for arbitrary computationspyre2
Python wrapper for RE2starlark-rust
A Rust implementation of the Starlark languageopenbmc
OpenBMC is an open software framework to build a complete Linux image for a Board Management Controller (BMC).SPARTA
SPARTA is a library of software components specially designed for building high-performance static analyzers based on the theory of Abstract Interpretation.time
Meta's Time librarieschef-cookbooks
Open source chef cookbooks.IT-CPE
Meta's Client Platform Engineering tools. Some of the tools we have written to help manage our fleet of client systems.dotslash
Simplified executable deploymentRapid
The OpenStreetMap editor driven by open data, AI, and supercharged featureslexical-ios
Lexical iOS is an extensible text editor framework that integrates the APIs and philosophies from Lexical Web with a Swift API built on top of TextKit.facebook-sdk-for-unity
The facebook sdk for unity.facebook-nodejs-business-sdk
Node.js SDK for Meta Marketing APIsFAI-PEP
Facebook AI Performance Evaluation Platformfacebook-java-business-sdk
Java SDK for Meta Marketing APIschef-utils
Utilities related to Chefopaque-ke
An implementation of the OPAQUE password-authenticated key exchange protocoldns
Collection of Meta's DNS Librariesfacebook360_dep
Facebook360 Depth Estimation Pipeline - https://facebook.github.io/facebook360_depakd
An implementation of an auditable key directorytac_plus
A Tacacs+ Daemon tested on Linux (CentOS) to run AAA via TACACS+ Protocol via IPv4 and IPv6.facebook-ruby-business-sdk
Ruby SDK for Meta Marketing APIusort
Safe, minimal import sorting for Python projects.grocery-delivery
The Grocery Delivery utility for managing cookbook uploads to distributed Chef backends.taste-tester
Software to manage a chef-zero instance and use it to test changes on production servers.TestSlide
A Python test frameworksapp
Post Processor for Facebook Static Analysis Tools.homebrew-fb
OS X Homebrew formulas to install Meta open source softwarethreat-research
Welcome to the Meta Threat Research Indicator Repository, a dedicated resource for the sharing of Indicators of Compromise (IOCs) and other threat indicators with the external research communitysquangle
SQuangLe is a C++ API for accessing MySQL serversocamlrep
Sets of libraries and tools to write applications and libraries mixing OCaml and Rust. These libraries will help keeping your types and data structures synchronized, and enable seamless exchange between OCaml and RustLove Open Source and this site? Check out how you can help us