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    153 repositories

    • hhvm

      Public
      A virtual machine for executing programs written in Hack.
      hacklangphphackhhvm
      C++
      •
      Other
      •3.1k•19k•407•96•Updated Oct 14, 2025Oct 14, 2025

    • fbthrift

      Public
      Facebook's branch of Apache Thrift, including a new C++ server.
      C++
      •
      Apache License 2.0
      •629•2.7k•41•3•Updated Oct 14, 2025Oct 14, 2025

    • buck2

      Public
      Build system, successor to Buck
      Rust
      •
      Apache License 2.0
      •301•4.1k•257•33•Updated Oct 14, 2025Oct 14, 2025

    • Ax

      Public
      Adaptive Experimentation Platform
      Python
      •
      MIT License
      •349•2.6k•20•92•Updated Oct 14, 2025Oct 14, 2025

    • folly

      Public
      An open-source C++ library developed and used at Facebook.
      C++
      •
      Apache License 2.0
      •5.8k•30k•301•110•Updated Oct 14, 2025Oct 14, 2025

    • igl

      Public
      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).
      C++
      •
      Other
      •198•3.1k•4•0•Updated Oct 14, 2025Oct 14, 2025

    • react-native

      Public
      A framework for building native applications using React
      mobilecross-platformapp-frameworkmobile-developmentreactandroidiosreact-native
      C++
      •
      MIT License
      •25k•124k•670•380•Updated Oct 14, 2025Oct 14, 2025

    • fboss

      Public
      Facebook Open Switching System Software for controlling network switches.
      C++
      •
      Other
      •356•922•24•46•Updated Oct 14, 2025Oct 14, 2025

    • pyrefly

      Public
      A fast type checker and language server for Python
      pythonrusttypecheckertypeslanguage-serveridetypingcode-qualityhacktoberfesttypecheck
      Rust
      •
      MIT License
      •159•3.9k•319•11•Updated Oct 14, 2025Oct 14, 2025

    • sapling

      Public
      A Scalable, User-Friendly Source Control System.
      Rust
      •
      GNU General Public License v2.0
      •321•6.6k•221•45•Updated Oct 14, 2025Oct 14, 2025

    • jemalloc

      Public
      Meta fork of the OG Jemalloc project
      C
      •
      Other
      •1.6k•180•1•3•Updated Oct 13, 2025Oct 13, 2025

    • facebook-nodejs-business-sdk

      Public
      Node.js SDK for Meta Marketing APIs
      JavaScript
      •
      Other
      •242•554•64•13•Updated Oct 13, 2025Oct 13, 2025

    • buck2-prelude

      Public
      Prelude for the Buck2 project
      Starlark
      •
      Apache License 2.0
      •52•59•1•1•Updated Oct 13, 2025Oct 13, 2025

    • capi-param-builder

      Public
      Conversions API parameter builder to help enhance the parameter qualities for Conversions API events
      JavaScript
      •
      Other
      •3•1•0•0•Updated Oct 13, 2025Oct 13, 2025

    • opaque-ke

      Public
      An implementation of the OPAQUE password-authenticated key exchange protocol
      Rust
      •
      Apache License 2.0
      •54•352•0•2•Updated Oct 13, 2025Oct 13, 2025

    • react

      Public
      The library for web and native user interfaces.
      reactjavascriptlibraryuifrontenddeclarative
      JavaScript
      •
      MIT License
      •50k•240k•803•230•Updated Oct 13, 2025Oct 13, 2025

    • fb303

      Public
      fb303 is a core set of thrift functions that provide a common mechanism for querying stats and other information from a service.
      C++
      •
      Apache License 2.0
      •60•84•6•12•Updated Oct 13, 2025Oct 13, 2025

    • mvfst

      Public
      An implementation of the QUIC transport protocol.
      C++
      •
      MIT License
      •274•1.6k•35•6•Updated Oct 13, 2025Oct 13, 2025

    • wangle

      Public
      Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.
      C++
      •
      Apache License 2.0
      •546•3.1k•34•12•Updated Oct 13, 2025Oct 13, 2025

    • buck2-shims-meta

      Public
      Shims to convert Meta internal buck2 macros/targets for open source build compatibility.
      Starlark
      •
      Apache License 2.0
      •6•3•0•0•Updated Oct 13, 2025Oct 13, 2025

    • ocamlrep

      Public
      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 Rust
      Rust
      •
      MIT License
      •23•134•0•4•Updated Oct 13, 2025Oct 13, 2025

    • time

      Public
      Meta's Time libraries
      Go
      •
      Apache License 2.0
      •80•628•5•2•Updated Oct 13, 2025Oct 13, 2025

    • pyre-check

      Public
      Performant type-checking for python.
      pythonsecuritytypecheckerstatic-analysisocamlcontrol-flow-analysiscode-qualityprogram-analysistaint-analysisabstract-interpretation
      OCaml
      •
      MIT License
      •452•7.1k•130•24•Updated Oct 13, 2025Oct 13, 2025

    • openbmc

      Public
      OpenBMC is an open software framework to build a complete Linux image for a Board Management Controller (BMC).
      C
      •
      Apache License 2.0
      •302•663•43•6•Updated Oct 13, 2025Oct 13, 2025

    • facebook-for-woocommerce

      Public
      The official plugin from Meta. This repository is now officially maintained by Meta's engineering team. We welcome and encourage contributions from the community.
      PHP
      •
      GNU General Public License v2.0
      •172•241•119•81•Updated Oct 13, 2025Oct 13, 2025

    • stylex

      Public
      StyleX is the styling system for ambitious user interfaces.
      JavaScript
      •
      MIT License
      •346•8.7k•70•15•Updated Oct 13, 2025Oct 13, 2025

    • docusaurus

      Public
      Easy to maintain open source documentation websites.
      reactjavascriptopen-sourcewebsitedocumentationhacktoberfest
      TypeScript
      •
      MIT License
      •9.5k•62k•290•56•Updated Oct 13, 2025Oct 13, 2025

    • relay

      Public
      Relay is a JavaScript framework for building data-driven React applications.
      Rust
      •
      MIT License
      •1.9k•19k•611•156•Updated Oct 13, 2025Oct 13, 2025

    • rocksdb

      Public
      A library that provides an embeddable, persistent key-value store for fast storage.
      storage-enginedatabase
      C++
      •
      GNU General Public License v2.0
      •6.6k•31k•788•515•Updated Oct 13, 2025Oct 13, 2025

    • react-native-devtools-frontend

      Public
      The Chrome DevTools UI, customized for React Native
      TypeScript
      •
      Other
      •606•54•0•0•Updated Oct 13, 2025Oct 13, 2025