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stetho

Stetho is a debug bridge for Android applications, enabling the powerful Chrome Developer Tools and much more.

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wdt

Warp speed Data Transfer (WDT) is an embeddedable library (and command line tool) aiming to transfer data between 2 systems as fast as possible over multiple TCP paths.

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presto

Distributed SQL query engine for running interactive analytic queries against big data sources.

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osquery

SQL powered operating system instrumentation, monitoring, and analytics.

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fatal

Facebook Template Library: a library for fast prototyping of software in C++11 and up.

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JavaScript 85 31

node-haste

A dependency management system for static resources for node.js.

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folly

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

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watchman

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

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flow

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

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rocksdb

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

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hhvm

A virtual machine designed for executing programs written in Hack and PHP.

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JavaScript 88 5

jscodeshift

A JavaScript codemod toolkit.

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Objective-C 5,379 677

AsyncDisplayKit

Smooth asynchronous user interfaces for iOS apps.

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JavaScript 108 8

fbjs

A collection of utility libraries used by other Facebook JS projects.

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JavaScript 25,668 3,777

react

A declarative, efficient, and flexible JavaScript library for building user interfaces.

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JavaScript 1,227 109

regenerator

Source transformer enabling ECMAScript 6 generator functions in JavaScript-of-today.

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Objective-C 4,615 490

xctool

A replacement for Apple's xcodebuild that makes it easier to build and test iOS or OSX apps.

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JavaScript 625 76

react-devtools

An extension that allows inspection of React component hierarchy in Chrome Developer Tools.

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Objective-C++ 2,243 189

componentkit

A React-inspired view framework for iOS.

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JavaScript 7,693 368

immutable-js

Immutable persistent data collections for Javascript which increase efficiency and simplicity.

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