The best + most organized React repo that you've come across?

I've been working with React for a couple years, but its usually just on my own, and I'm seeking ways to level up my knowledge of it, especially around component composition, design patterns and usage of more advanced hooks (where applicable). I learn a lot my perusing other people's code, so I'm curious what repos you guys have come across (or even your own) that you feel are really worth a look?