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urbit.org/concepts/source-code-overview.md
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2title = "Source Code Overview"
3weight = 2
4template = "doc.html"
5description = "An explanation of Urbit's constituent GitHub repos."
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7We host all our source code on GitHub at [github.com/urbit](https://github.com/urbit).
9Since there's quite a number of repos, we'll talk about a few of the most
10important ones here:
12## [`urbit/urbit`](https://github.com/urbit/urbit)
14This is the main Urbit repo. It contains the Urbit interpreter (all of the C code) and is the main entry point if you're going to build from source.
16## [`urbit/arvo`](https://github.com/urbit/arvo)
18Arvo is the Urbit operating system (written in Hoon). When you boot your Urbit, you get this over the air. The source code is kept here, and you'll need it if you want to do any heavy development work.
20Interesting in working on Urbit documentation? This repository is where all the collaboration happens. The docs themselves are just markdown files hosted on a live ship.
22## [`urbit/urbit.org`](https://github.com/urbit/urbit.org)
24This is where the source code for urbit.org lives. Like the docs, the urbit.org website is just a collection of a few markdown files rendered by Tree, the Urbit web publishing system.
26We're working on a new Urbit style guide for urbit.org, the docs and Urbit web apps. If you're into visual design or are a CSS fanatic, jump in here.
28## [`urbit.org/azimuth`](https://github.com/urbit/azimuth)
30Azimuth is a general-purpose PKI that Urbit uses for network identities.