Concord
Concord is a software package (written in Python, for Django) which makes it easier for websites to implement complex and flexible governance/permissions structures for their users. Learn more via the Github repository and documentation.
You can see a demo of the library, and Kybern, a site which implements it, here.
Kybern
Kybern is a website which implements the Concord library. The code which runs it can be found on Github. Please contact us to get early access to the platform.
You can see a demo of the platform (and of Concord, the library behind it) here.
You can also see some screenshots via this post.