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    162 repositories

    • stylex

      Public
      StyleX is the styling system for ambitious user interfaces.
      JavaScript
      •
      MIT License
      •391•9.1k•94•26•Updated Feb 23, 2026Feb 23, 2026

    • hhvm

      Public
      A virtual machine for executing programs written in Hack.
      phphackhhvmhacklang
      C++
      •
      Other
      •3.1k•19k•410•113•Updated Feb 23, 2026Feb 23, 2026

    • folly

      Public
      An open-source C++ library developed and used at Facebook.
      C++
      •
      Apache License 2.0
      •5.8k•30k•308•127•Updated Feb 23, 2026Feb 23, 2026

    • fboss

      Public
      Facebook Open Switching System Software for controlling network switches.
      C++
      •
      Other
      •379•955•25•117•Updated Feb 23, 2026Feb 23, 2026

    • pyre-check

      Public
      Performant type-checking for python.
      pythonsecuritytypecheckerstatic-analysisocamlcontrol-flow-analysiscode-qualityprogram-analysistaint-analysisabstract-interpretation
      OCaml
      •
      MIT License
      •451•7.1k•131•24•Updated Feb 23, 2026Feb 23, 2026

    • lexical

      Public
      Lexical is an extensible text editor framework that provides excellent reliability, accessibility and performance.
      TypeScript
      •
      MIT License
      •2.1k•23k•540•19•Updated Feb 23, 2026Feb 23, 2026

    • proxygen

      Public
      A collection of C++ HTTP libraries including an easy to use HTTP server.
      C++
      •
      Other
      •1.5k•8.3k•24•15•Updated Feb 23, 2026Feb 23, 2026

    • sapling

      Public
      A Scalable, User-Friendly Source Control System.
      Rust
      •
      GNU General Public License v2.0
      •347•6.7k•234•63•Updated Feb 23, 2026Feb 23, 2026

    • litho

      Public
      A declarative framework for building efficient UIs on Android.
      Kotlin
      •
      Apache License 2.0
      •765•7.8k•57•53•Updated Feb 23, 2026Feb 23, 2026

    • fbthrift

      Public
      Facebook's branch of Apache Thrift, including a new C++ server.
      C++
      •
      Apache License 2.0
      •629•2.7k•44•5•Updated Feb 22, 2026Feb 22, 2026

    • buck2

      Public
      Build system, successor to Buck
      Rust
      •
      Apache License 2.0
      •329•4.3k•281•75•Updated Feb 22, 2026Feb 22, 2026

    • buck2-prelude

      Public
      Prelude for the Buck2 project
      Starlark
      •
      Apache License 2.0
      •60•61•1•1•Updated Feb 22, 2026Feb 22, 2026

    • react

      Public
      The library for web and native user interfaces.
      reactjavascriptlibraryuifrontenddeclarative
      JavaScript
      •
      MIT License
      •51k•243k•810•335•Updated Feb 22, 2026Feb 22, 2026

    • CacheLib

      Public
      Pluggable in-process caching engine to build and scale high performance services
      performancecppcacheconcurrencyssdcache-engine
      C++
      •
      Apache License 2.0
      •314•1.5k•15•30•Updated Feb 22, 2026Feb 22, 2026

    • 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
      •62•92•6•13•Updated Feb 22, 2026Feb 22, 2026

    • openr

      Public
      Distributed platform for building autonomic network functions.
      C++
      •
      MIT License
      •246•928•10•10•Updated Feb 22, 2026Feb 22, 2026

    • mvfst

      Public
      An implementation of the QUIC transport protocol.
      C++
      •
      MIT License
      •279•1.6k•39•5•Updated Feb 22, 2026Feb 22, 2026

    • 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
      •544•3.1k•34•13•Updated Feb 22, 2026Feb 22, 2026

    • watchman

      Public
      Watches files and records, or triggers actions, when they change.
      C++
      •
      MIT License
      •1k•14k•210•29•Updated Feb 22, 2026Feb 22, 2026

    • Ax

      Public
      Adaptive Experimentation Platform
      Python
      •
      MIT License
      •358•2.7k•37•139•Updated Feb 22, 2026Feb 22, 2026

    • flow

      Public
      Adds static typing to JavaScript to improve developer productivity and code quality.
      OCaml
      •
      MIT License
      •1.9k•22k•600•13•Updated Feb 22, 2026Feb 22, 2026

    • pyrefly

      Public
      A fast type checker and language server for Python
      pythonrusttypecheckertypeslanguage-serveridetypingcode-qualityhacktoberfesttypecheck
      Rust
      •
      MIT License
      •276•5.4k•389•74•Updated Feb 22, 2026Feb 22, 2026

    • react-native

      Public
      A framework for building native applications using React
      reactandroidiosmobilereact-nativecross-platformapp-frameworkmobile-development
      C++
      •
      MIT License
      •25k•125k•744•475•Updated Feb 22, 2026Feb 22, 2026

    • react-strict-dom

      Public
      React Strict DOM (RSD) standardizes the development of styled React components for web and native.
      JavaScript
      •
      MIT License
      •189•3.5k•44•24•Updated Feb 22, 2026Feb 22, 2026

    • react-native-website

      Public
      The React Native website and docs
      reactreact-nativedocusaurus
      TypeScript
      •
      MIT License
      •5.8k•2.1k•11•98•Updated Feb 22, 2026Feb 22, 2026

    • bpfilter

      Public
      eBPF-based packet filtering framework
      C
      •
      GNU General Public License v2.0
      •52•310•24•5•Updated Feb 22, 2026Feb 22, 2026

    • 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
      •300•672•43•7•Updated Feb 22, 2026Feb 22, 2026

    • jemalloc

      Public
      Meta fork of the OG Jemalloc project
      C
      •
      Other
      •1.6k•240•1•6•Updated Feb 21, 2026Feb 21, 2026

    • sapp

      Public
      Post Processor for Facebook Static Analysis Tools.
      Python
      •
      MIT License
      •46•140•8•14•Updated Feb 21, 2026Feb 21, 2026

    • starlark-rust

      Public
      A Rust implementation of the Starlark language
      Rust
      •
      Apache License 2.0
      •85•936•30•22•Updated Feb 21, 2026Feb 21, 2026