pagetree is a helper for building sites that are organized as a hierarchy of pages which the user/visitor goes through in (depth-first) order.
the pages can then each have 'blocks' attached to them which are content or interactive things.
see django-pageblocks for a basic set of these blocks.
pagetree is designed to allow this kind of site to be built by an editor through the web. it aims to provide the minimum amount of functionality possible and stay out of the way as much as possible.
Documentation for pagetree is on readthedocs.