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I'm surprised no one has mentioned the Linux Kernel!

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...

It is quite clean when you consider the task that it accomplishes.

Being able to compile across multiple architectures/endian-ness,32/64-bit/scale up/down from server/desktop/router/phone while accepting contributions from thousands of people..

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It's not clean at all. Thousands of different styles, no single convention on function-naming, etc.

Want a clean kernel, go look at the BSDs.

One thing the Linux kernel has going for it is that there are a lot of books that describe how the various parts work and how to use the various internal interfaces. I can't think of any other open source project that has multiple books on how to contribute.

(Sadly, most of those good kernel books were written in the 90's and early 2000's. I don't know if there are any recent kernel hacking books.)

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