We work hard to contribute our work back to the web, mobile, big data, & infrastructure communities. NB: members must have two-factor auth.
Friendly Syntax & Toolchain Powered by OCaml
Watches files and records, or triggers actions, when they change.
A fast build system that encourages the creation of small, reusable modules over a variety of platforms and languages.
Facebook's branch of Apache Thrift, including a new C++ server.
A library that provides an embeddable, persistent key-value store for fast storage.
Adds static typing to JavaScript to improve developer productivity and code quality.
A framework for building native apps with React.
A virtual machine designed for executing programs written in Hack and PHP.
An open IDE for web and native mobile development, built on top of Atom
A static analyzer for Java, C and Objective-C
A bytecode optimizer for Android apps
An open-source C++ library developed and used at Facebook.
A declarative, efficient, and flexible JavaScript library for building user interfaces.
Share threat information with vetted partners
Facebook's branch of the Oracle MySQL v5.6 database. This includes MyRocks.
Copy commits between repositories - git => git or git => hg
Smooth asynchronous user interfaces for iOS apps.
Surround360 is Facebook's open source hardware and software for capturing stereoscopic 3D 360 video for VR. The repo contains hardware designs, as well as software for camera control and rendering.
Yoga is a cross-platform layout engine which implements Flexbox. Yoga enables maximum collaboration within your team by implementing an API familiar to many designers and opening it up to developers across different platforms.
An Android library for managing images and the memory they use.
screenshot-test-for-android is a library that can generate fast deterministic screenshots while running instrumentation tests in android.
A fork of ProGuard.
An SDK built to facilitate application development for Facebook Ads API.
Zstandard - Fast real-time compression algorithm
Platform to host Capture the Flag competitions
A collection of C++ HTTP libraries including an easy to use HTTP server.
The Facebook SDK for PHP provides a native interface to the Graph API and Facebook Login. https://developers.facebook.com/docs/php
The Facebook Instant Articles SDK for PHP provides a native interface for creating and publishing Instant Articles.
Facebook libraries and utilities for Lua

Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.
