EverWiki is a wiki-like structure / interface built on top of Evernote. The goal is to provide an interface to organize and interlink your Evernote notes, as well as to provide a structure to manage permissions, notifications, and comments on those notes.
Update July 5th, 2020: I have no idea where this little fragment of writing came from. Likely something with an interface to WordPress I was testing, and writing up something I would like to see. Today, we have tools like Roam.