[Codas]

The rust compiler itself would certainly not be the best resource, but I thing servo[1] would do just fine. Also, you can just look at some rust repositories[2] on github.

[1]: https://github.com/mozilla/servo/

[2]: https://github.com/trending?l=rust

[sanderjd]

This is a few entries down in the trending list you linked, but rust-http[1] is currently my favorite example of a very non-trivial and actively developed rust library.

1: https://github.com/chris-morgan/rust-http