Which Rust-written Python tools are folks using?

I know of two big ones: ruff (linting) and pyflow (dependency management). The standard lib crypto module uses rust, too.

Are there other ones I should know about? Maybe replacements for mypy, pre-commit, tox/nox?

Does Pydantic use rust? When I check the github repo, it shows 100% python.

The Rust re-write is being worked on in a separate repo: https://github.com/pydantic/pydantic-core