PyAMS (Pyramid Application Management Suite) is a small suite of packages written for applications and content management with the Pyramid framework.
PyAMS is actually mainly used to manage web sites through content management applications (CMS, see PyAMS_content package), but many features are generic and can be used inside any kind of web application.
All PyAMS documentation is available on ReadTheDocs; source code is available on Gitlab and pushed to Github.
PyAMS_layer is adding the concept of 'skin layers' to Pyramid.
A layer is a marker interface which will be used to tag a Request object; this tagging will allow you to register templates, views or pagelets for only specific layers.
Skins are global utilities which have a "layer" attribute; when a skin is associated with a context, the request is marked during traversal with this layer (removing all other layers interfaces).