[fastball]

They have a "What's Left?"[1] and the results of running RustPython against the CPython test suite[2] up on the website.

[1] https://rustpython.github.io/pages/whats-left

[2] https://rustpython.github.io/pages/regression-tests-results....

[snthpy]

sqlite3 is the main one on that list that jumps out at me.