An application server built upon the Pyramid web framework. It provides a user interface for managing content as well as libraries and utilities which make it easy to create applications.
Visit the main website at http://substanced.net for FAQs and documentation.
There is a mailing list: https://groups.google.com/group/substanced-users
The code is at https://github.com/Pylons/substanced
The IRC channel is at irc://freenode.net/#substanced