document-based-database

CouchDB - .NET or Mono Equivalent Technology

Is there any active "document-based" database projects using .NET or Mono? Something similar to CouchDB, SimpleDB, LotusNotes, etc... Prefer open source. I figure the JScript.NET technology could be used for the Map and Reduce functions over stored JSON documents. ...

Are there any CMS based on document-based database?

I did some googling, not much come up. ...