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docusaurus

★ 66,248

Docusaurus builds, deploys, and maintains open source documentation websites, with built-in localization, a blog, and customizable pages so you can focus on content.

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rocksdb

★ 32,100

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

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folly

★ 30,541

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

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flow

★ 22,288

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

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astryx

★ 13,080

Astryx is Meta's customizable React design system, with tokens and components prepared for both developers and coding agents.

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pyrefly

★ 6,967

A fast type checker and language server for Python. Understands real-world Python. Built-in support for frameworks and tools like Pydantic, Django, and pytest, with model validation, field types, fixture navigation, and autocomplete that work out of the box.

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buck2

★ 4,425

Build system, successor to Buck. But what do those words really mean for a build system — and why might they interest you?

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fbthrift

★ 2,698

Project brief: A Facebook-maintained Apache Thrift branch with a redesigned C++ server, offering runtime support for major languages like C++, Python, Hack, and Java.