Repositories list

• buck2

  Public
  Build system, successor to Buck

  Rust

  •

  Apache License 2.0

  •419419 forks in meta/buck2•4.5k4.5k stars in meta/buck2•300300 issues in meta/buck2•126126 pull requests in meta/buck2•Updated Oct 31, 2026Oct 31, 2026

• lexical

  Public
  Lexical is an extensible text editor framework that provides excellent reliability, accessibility and performance.

  TypeScript

  •

  MIT License

  •2.3k2.3k forks in meta/lexical•24k24k stars in meta/lexical•335335 issues in meta/lexical•8787 pull requests in meta/lexical•Updated Oct 31, 2026Oct 31, 2026

• idb

  Public
  idb is a flexible command line interface for automating iOS simulators and devices

  Swift

  •

  MIT License

  •518518 forks in meta/idb•5.4k5.4k stars in meta/idb•179179 issues in meta/idb•1919 pull requests in meta/idb•Updated Oct 30, 2026Oct 30, 2026

• astryx

  Public
  An open source design system that's fully customizable and agent ready

  TypeScript

  •

  MIT License

  •1.1k1.1k forks in meta/astryx•14k14k stars in meta/astryx•363363 issues in meta/astryx•595595 pull requests in meta/astryx•Updated Oct 30, 2026Oct 30, 2026

• sapling

  Public
  A Scalable, User-Friendly Source Control System.

  Rust

  •

  GNU General Public License v2.0

  •415415 forks in meta/sapling•7.2k7.2k stars in meta/sapling•244244 issues in meta/sapling•135135 pull requests in meta/sapling•Updated Oct 30, 2026Oct 30, 2026

• fboss

  Public
  Facebook Open Switching System Software for controlling network switches.

  C++

  •

  Other

  •417417 forks in meta/fboss•1k1k stars in meta/fboss•2626 issues in meta/fboss•215215 pull requests in meta/fboss•Updated Oct 30, 2026Oct 30, 2026

• redex

  Public
  A bytecode optimizer for Android apps

  C++

  •

  MIT License

  •681681 forks in meta/redex•6.3k6.3k stars in meta/redex•5656 issues in meta/redex•1818 pull requests in meta/redex•Updated Oct 30, 2026Oct 30, 2026

• buck2-prelude

  Public
  Prelude for the Buck2 project

  Starlark

  •

  Apache License 2.0

  •6969 forks in meta/buck2-prelude•7474 stars in meta/buck2-prelude•11 issue in meta/buck2-prelude•11 pull request in meta/buck2-prelude•Updated Oct 30, 2026Oct 30, 2026

• rocksdb

  Public
  A library that provides an embeddable, persistent key-value store for fast storage.

  databasestorage-engine

  databasestorage-engine

  C++

  •

  GNU General Public License v2.0

  •7k7k forks in meta/rocksdb•32k32k stars in meta/rocksdb•976976 issues in meta/rocksdb•826826 pull requests in meta/rocksdb•Updated Oct 30, 2026Oct 30, 2026

• hermes

  Public
  A JavaScript engine optimized for running React Native.

  JavaScript

  •

  MIT License

  •894894 forks in meta/hermes•11k11k stars in meta/hermes•160160 issues in meta/hermes•130130 pull requests in meta/hermes•Updated Oct 30, 2026Oct 30, 2026

• flow

  Public
  Adds static typing to JavaScript to improve developer productivity and code quality.

  Rust

  •

  MIT License

  •1.9k1.9k forks in meta/flow•22k22k stars in meta/flow•507507 issues in meta/flow•55 pull requests in meta/flow•Updated Oct 30, 2026Oct 30, 2026

• fbthrift

  Public
  Meta's Thrift implementation: cross-language serialization and high-performance async RPC

  C++

  •

  Apache License 2.0

  •649649 forks in meta/fbthrift•2.7k2.7k stars in meta/fbthrift•4545 issues in meta/fbthrift•77 pull requests in meta/fbthrift•Updated Oct 30, 2026Oct 30, 2026

• openr

  Public
  Distributed platform for building autonomic network functions.

  C++

  •

  MIT License

  •254254 forks in meta/openr•939939 stars in meta/openr•1111 issues in meta/openr•1010 pull requests in meta/openr•Updated Oct 30, 2026Oct 30, 2026

• openzl

  Public
  A novel take on lossless data compression

  C++

  •

  Other

  •178178 forks in meta/openzl•3.3k3.3k stars in meta/openzl•3737 issues in meta/openzl•7878 pull requests in meta/openzl•Updated Oct 30, 2026Oct 30, 2026

• dns

  Public
  Collection of Meta's DNS Libraries

  Go

  •

  Apache License 2.0

  •3232 forks in meta/dns•300300 stars in meta/dns•44 issues in meta/dns•11 pull request in meta/dns•Updated Oct 30, 2026Oct 30, 2026

• folly

  Public
  An open-source C++ library developed and used at Facebook.

  C++

  •

  Apache License 2.0

  •5.9k5.9k forks in meta/folly•31k31k stars in meta/folly•331331 issues in meta/folly•156156 pull requests in meta/folly•Updated Oct 30, 2026Oct 30, 2026

• rebalancer

  Public
  Rebalancer is a domain-specific language and tool for specifying and solving assignment problems (eg, putting balls in boxes with complex rules).

  C++

  •

  Apache License 2.0

  •4747 forks in meta/rebalancer•473473 stars in meta/rebalancer•11 issue in meta/rebalancer•1111 pull requests in meta/rebalancer•Updated Oct 30, 2026Oct 30, 2026

• proxygen

  Public
  A collection of C++ HTTP libraries including an easy to use HTTP server.

  C++

  •

  Other

  •1.5k1.5k forks in meta/proxygen•8.4k8.4k stars in meta/proxygen•2525 issues in meta/proxygen•2020 pull requests in meta/proxygen•Updated Oct 30, 2026Oct 30, 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

  •545545 forks in meta/wangle•3.1k3.1k stars in meta/wangle•3434 issues in meta/wangle•1414 pull requests in meta/wangle•Updated Oct 30, 2026Oct 30, 2026

• pyrefly

  Public
  A fast type checker and language server for Python

  pythonrusttypechecker+ 14

  pythonrusttypecheckertypeslanguage-serveridelanguage-server-protocoltypingvscode-extensioncode-quality+ 7

  Rust

  •

  MIT License

  •580580 forks in meta/pyrefly•7.2k7.2k stars in meta/pyrefly•564564 issues in meta/pyrefly•118118 pull requests in meta/pyrefly•Updated Oct 30, 2026Oct 30, 2026

• watchman

  Public
  Watches files and records, or triggers actions, when they change.

  C++

  •

  MIT License

  •1.1k1.1k forks in meta/watchman•14k14k stars in meta/watchman•224224 issues in meta/watchman•3939 pull requests in meta/watchman•Updated Oct 30, 2026Oct 30, 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

  •6868 forks in meta/fb303•9999 stars in meta/fb303•66 issues in meta/fb303•1212 pull requests in meta/fb303•Updated Oct 30, 2026Oct 30, 2026

• mcrouter

  Public
  Mcrouter is a memcached protocol router for scaling memcached deployments.

  C++

  •

  MIT License

  •554554 forks in meta/mcrouter•3.3k3.3k stars in meta/mcrouter•9696 issues in meta/mcrouter•2020 pull requests in meta/mcrouter•Updated Oct 30, 2026Oct 30, 2026

• BGP

  Public
  Meta's BGP (Border Gateway Protocol) routing daemon for large-scale data center networks, built as part of the FBOSS forwarding stack.

  C++

  •

  Apache License 2.0

  •99 forks in meta/BGP•1515 stars in meta/BGP•00 issues in meta/BGP•44 pull requests in meta/BGP•Updated Oct 30, 2026Oct 30, 2026

• CacheLib

  Public
  Pluggable in-process caching engine to build and scale high performance services

  performancecppcache+ 3

  performancecppcacheconcurrencyssdcache-engine

  C++

  •

  Apache License 2.0

  •327327 forks in meta/CacheLib•1.6k1.6k stars in meta/CacheLib•00 issues in meta/CacheLib•2020 pull requests in meta/CacheLib•Updated Oct 30, 2026Oct 30, 2026

• facebook-ios-sdk

  Public
  Used to integrate the Facebook Platform with your iOS & tvOS apps.

  Swift

  •

  Other

  •3.7k3.7k forks in meta/facebook-ios-sdk•8.1k8.1k stars in meta/facebook-ios-sdk•151151 issues in meta/facebook-ios-sdk•66 pull requests in meta/facebook-ios-sdk•Updated Oct 30, 2026Oct 30, 2026

• mariana-trench

  Public
  A security focused static analysis tool for Android and Java applications.

  C++

  •

  MIT License

  •161161 forks in meta/mariana-trench•1.3k1.3k stars in meta/mariana-trench•3939 issues in meta/mariana-trench•1919 pull requests in meta/mariana-trench•Updated Oct 30, 2026Oct 30, 2026

• litho

  Public
  A declarative framework for building efficient UIs on Android.

  Kotlin

  •

  Apache License 2.0

  •770770 forks in meta/litho•7.8k7.8k stars in meta/litho•6060 issues in meta/litho•5757 pull requests in meta/litho•Updated Oct 30, 2026Oct 30, 2026

• 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…

  C++

  •

  Other

  •223223 forks in meta/igl•3.2k3.2k stars in meta/igl•00 issues in meta/igl•00 pull requests in meta/igl•Updated Oct 30, 2026Oct 30, 2026

• docusaurus

  Public
  Easy to maintain open source documentation websites.

  reactjavascriptopen-source+ 3

  reactjavascriptopen-sourcewebsitedocumentationhacktoberfest

  TypeScript

  •

  MIT License

  •10k10k forks in meta/docusaurus•67k67k stars in meta/docusaurus•275275 issues in meta/docusaurus•156156 pull requests in meta/docusaurus•Updated Oct 30, 2026Oct 30, 2026