A Django-based CMS with a focus on extensibility and concise code.
From the docs:
FeinCMS is an extremely stupid content management system. It knows nothing about content – just enough to create an admin interface for your own page content types. It lets you reorder page content blocks using a drag-drop interface, and you can add as many content blocks to a region (f.e. the sidebar, the main content region or something else which I haven’t thought of yet). It provides helper functions, which provide ordered lists of page content blocks. That’s all.
Source: FeinCMS