Ask HN: Web framework independent Python libraries useful for web development.

Flatland for form processing. Formencode is a more mature, if not as easy/flexible to use alternative.

Nose or py.test for testing.

Other template engines would be e.g. Mako and Genshi.

Lamson for email handling.

Although from a different angle, mechanize is wonderful (for the testing part), along with the Selenium python bindings (but that one's not pure python).

Werkzeug or WebOb if you're using WSGI.

I like kid and jinja2 for templating.