ECO is a model driven ORM framework from Capable Objects in Sweden (www.capableobjects.com). They traditionally have been connected with Borland, but have recently released a version for Visual Studio.
ECO has support for a wide variety of database backends, but not currently for VistaDB (www.vistadb.net). This project aims to fill that gap, until ECO provides that support.
You may find some more details in my blog: http://kearon.blogspot.com