XStatic is a Python web development tool for handling required static data files from external projects, such as CSS, images, and JavaScript. It provides a lightweight infrastructure to manage them via Python modules that your app can depend on in a portable, virtualenv-friendly way instead of using embedded copies.

Js-YAML is an implementation of YAML, a human-friendly data serialization language. Started as PyYAML port, it was completely rewritten from scratch. Now it's very fast, and supports 1.2 spec.