Divmod Nevow is a web application construction kit written in Python. It is
designed to allow the programmer to express as much of the view logic as
desired in Python, and includes a pure Python XML expression syntax named stan
to facilitate this. However it also provides rich support for designer-edited
templates, using a very small XML attribute language to provide bi-directional
template manipulation capability.

Nevow also includes Divmod Athena, a "two way web" or "COMET" implementation,
providing a two-way bridge between Python code on the server and JavaScript
code on the client. Modular portions of a page, known as "athena fragments" in
the server python and "athena widgets" in the client javascript, can be
individually developed and placed on any Nevow-rendered page with a small
template renderer. Athena abstracts the intricacies of HTTP communication,
session security, and browser-specific bugs behind a simple remote-method-call
interface, where individual widgets or fragments can call remote methods on
their client or server peer with one method: "callRemote".