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    • stylex

      Public
      StyleX is the styling system for ambitious user interfaces.
      JavaScript
      3919.1k9426Updated Feb 23, 2026Feb 23, 2026
    • hhvm

      Public
      A virtual machine for executing programs written in Hack.
      C++
      3.1k19k410113Updated Feb 23, 2026Feb 23, 2026
    • folly

      Public
      An open-source C++ library developed and used at Facebook.
      C++
      5.8k30k308127Updated Feb 23, 2026Feb 23, 2026
    • fboss

      Public
      Facebook Open Switching System Software for controlling network switches.
      C++
      37995525117Updated Feb 23, 2026Feb 23, 2026
    • pyre-check

      Public
      Performant type-checking for python.
      OCaml
      4517.1k13124Updated Feb 23, 2026Feb 23, 2026
    • lexical

      Public
      Lexical is an extensible text editor framework that provides excellent reliability, accessibility and performance.
      TypeScript
      2.1k23k54019Updated Feb 23, 2026Feb 23, 2026
    • proxygen

      Public
      A collection of C++ HTTP libraries including an easy to use HTTP server.
      C++
      1.5k8.3k2415Updated Feb 23, 2026Feb 23, 2026
    • sapling

      Public
      A Scalable, User-Friendly Source Control System.
      Rust
      3476.7k23463Updated Feb 23, 2026Feb 23, 2026
    • litho

      Public
      A declarative framework for building efficient UIs on Android.
      Kotlin
      7657.8k5753Updated Feb 23, 2026Feb 23, 2026
    • fbthrift

      Public
      Facebook's branch of Apache Thrift, including a new C++ server.
      C++
      6292.7k445Updated Feb 22, 2026Feb 22, 2026
    • buck2

      Public
      Build system, successor to Buck
      Rust
      3294.3k28175Updated Feb 22, 2026Feb 22, 2026
    • buck2-prelude

      Public
      Prelude for the Buck2 project
      Starlark
      606111Updated Feb 22, 2026Feb 22, 2026
    • react

      Public
      The library for web and native user interfaces.
      JavaScript
      51k243k810335Updated Feb 22, 2026Feb 22, 2026
    • CacheLib

      Public
      Pluggable in-process caching engine to build and scale high performance services
      C++
      3141.5k1530Updated 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++
      6292613Updated Feb 22, 2026Feb 22, 2026
    • openr

      Public
      Distributed platform for building autonomic network functions.
      C++
      2469281010Updated Feb 22, 2026Feb 22, 2026
    • mvfst

      Public
      An implementation of the QUIC transport protocol.
      C++
      2791.6k395Updated 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++
      5443.1k3413Updated Feb 22, 2026Feb 22, 2026
    • watchman

      Public
      Watches files and records, or triggers actions, when they change.
      C++
      1k14k21029Updated Feb 22, 2026Feb 22, 2026
    • Ax

      Public
      Adaptive Experimentation Platform
      Python
      3582.7k37139Updated Feb 22, 2026Feb 22, 2026
    • flow

      Public
      Adds static typing to JavaScript to improve developer productivity and code quality.
      OCaml
      1.9k22k60013Updated Feb 22, 2026Feb 22, 2026
    • pyrefly

      Public
      A fast type checker and language server for Python
      Rust
      2765.4k38974Updated Feb 22, 2026Feb 22, 2026
    • react-native

      Public
      A framework for building native applications using React
      C++
      25k125k744475Updated 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
      1893.5k4424Updated Feb 22, 2026Feb 22, 2026
    • react-native-website

      Public
      The React Native website and docs
      TypeScript
      5.8k2.1k1198Updated Feb 22, 2026Feb 22, 2026
    • bpfilter

      Public
      eBPF-based packet filtering framework
      C
      52310245Updated 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
      300672437Updated Feb 22, 2026Feb 22, 2026
    • jemalloc

      Public
      Meta fork of the OG Jemalloc project
      C
      1.6k24016Updated Feb 21, 2026Feb 21, 2026
    • sapp

      Public
      Post Processor for Facebook Static Analysis Tools.
      Python
      46140814Updated Feb 21, 2026Feb 21, 2026
    • starlark-rust

      Public
      A Rust implementation of the Starlark language
      Rust
      859363022Updated Feb 21, 2026Feb 21, 2026