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    153 repositories

    • react

      Public
      The library for web and native user interfaces.
      reactjavascriptlibraryuifrontenddeclarative
      JavaScript
      •
      MIT License
      •50k•240k•800•237•Updated Oct 16, 2025Oct 16, 2025

    • jemalloc

      Public
      Meta fork of the OG Jemalloc project
      C
      •
      Other
      •1.6k•180•1•3•Updated Oct 16, 2025Oct 16, 2025

    • sapling

      Public
      A Scalable, User-Friendly Source Control System.
      Rust
      •
      GNU General Public License v2.0
      •320•6.6k•221•45•Updated Oct 16, 2025Oct 16, 2025

    • ThreatExchange

      Public
      Trust & Safety tools for working together to fight digital harms.
      hashingimagevideoperceptual-hashingimage-hashingvideo-hashingimage-similaritythreatexchangencmecvideo-similarity
      C++
      •
      Other
      •337•1.3k•52•5•Updated Oct 15, 2025Oct 15, 2025

    • Ax

      Public
      Adaptive Experimentation Platform
      Python
      •
      MIT License
      •349•2.6k•20•98•Updated Oct 15, 2025Oct 15, 2025

    • pyrefly

      Public
      A fast type checker and language server for Python
      pythonrusttypecheckertypeslanguage-serveridetypingcode-qualityhacktoberfesttypecheck
      Rust
      •
      MIT License
      •160•4k•326•14•Updated Oct 15, 2025Oct 15, 2025

    • hhvm

      Public
      A virtual machine for executing programs written in Hack.
      phphackhhvmhacklang
      C++
      •
      Other
      •3.1k•19k•407•96•Updated Oct 15, 2025Oct 15, 2025

    • fbthrift

      Public
      Facebook's branch of Apache Thrift, including a new C++ server.
      C++
      •
      Apache License 2.0
      •629•2.7k•42•3•Updated Oct 15, 2025Oct 15, 2025

    • dotslash

      Public
      Simplified executable deployment
      Rust
      •
      Apache License 2.0
      •37•763•15•5•Updated Oct 15, 2025Oct 15, 2025

    • opaque-ke

      Public
      An implementation of the OPAQUE password-authenticated key exchange protocol
      Rust
      •
      Apache License 2.0
      •54•352•0•4•Updated Oct 15, 2025Oct 15, 2025

    • mcrouter

      Public
      Mcrouter is a memcached protocol router for scaling memcached deployments.
      C++
      •
      MIT License
      •551•3.3k•97•20•Updated Oct 15, 2025Oct 15, 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 15, 2025Oct 15, 2025

    • fboss

      Public
      Facebook Open Switching System Software for controlling network switches.
      C++
      •
      Other
      •356•923•24•50•Updated Oct 15, 2025Oct 15, 2025

    • buck2

      Public
      Build system, successor to Buck
      Rust
      •
      Apache License 2.0
      •301•4.1k•256•35•Updated Oct 15, 2025Oct 15, 2025

    • fresco

      Public
      An Android library for managing images and the memory they use.
      Java
      •
      MIT License
      •3.8k•17k•242•11•Updated Oct 15, 2025Oct 15, 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 15, 2025Oct 15, 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
      •304•663•43•6•Updated Oct 15, 2025Oct 15, 2025

    • rocksdb

      Public
      A library that provides an embeddable, persistent key-value store for fast storage.
      databasestorage-engine
      C++
      •
      GNU General Public License v2.0
      •6.6k•31k•787•517•Updated Oct 15, 2025Oct 15, 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 15, 2025Oct 15, 2025

    • infer

      Public
      A static analyzer for Java, C, C++, and Objective-C
      cjavaobjective-ccppstatic-code-analysisstatic-analysiscode-quality
      OCaml
      •
      MIT License
      •2.1k•15k•383•4•Updated Oct 15, 2025Oct 15, 2025

    • flow

      Public
      Adds static typing to JavaScript to improve developer productivity and code quality.
      OCaml
      •
      MIT License
      •1.9k•22k•618•15•Updated Oct 15, 2025Oct 15, 2025

    • redex

      Public
      A bytecode optimizer for Android apps
      C++
      •
      MIT License
      •676•6.2k•56•17•Updated Oct 15, 2025Oct 15, 2025

    • lexical

      Public
      Lexical is an extensible text editor framework that provides excellent reliability, accessibility and performance.
      TypeScript
      •
      MIT License
      •2k•22k•516•30•Updated Oct 15, 2025Oct 15, 2025

    • mvfst

      Public
      An implementation of the QUIC transport protocol.
      C++
      •
      MIT License
      •274•1.6k•35•6•Updated Oct 15, 2025Oct 15, 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 15, 2025Oct 15, 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 15, 2025Oct 15, 2025

    • stylex

      Public
      StyleX is the styling system for ambitious user interfaces.
      JavaScript
      •
      MIT License
      •346•8.7k•69•15•Updated Oct 15, 2025Oct 15, 2025

    • react-native

      Public
      A framework for building native applications using React
      reactandroidiosmobilereact-nativecross-platformapp-frameworkmobile-development
      C++
      •
      MIT License
      •25k•124k•669•381•Updated Oct 15, 2025Oct 15, 2025

    • pyre-check

      Public
      Performant type-checking for python.
      pythonsecuritytypecheckerstatic-analysisocamlcontrol-flow-analysiscode-qualityprogram-analysistaint-analysisabstract-interpretation
      OCaml
      •
      MIT License
      •452•7.1k•131•24•Updated Oct 15, 2025Oct 15, 2025

    • ktfmt

      Public
      A program that reformats Kotlin source code to comply with the common community standard for Kotlin code conventions.
      Kotlin
      •
      Apache License 2.0
      •88•1.1k•42•2•Updated Oct 15, 2025Oct 15, 2025