Base4.NET

Base4 is a powerful open source platform and API for extending and integrating existing legacy and 3rd party databases. It is more than just a product it is a philosophy, and approach to integration that makes sense.

Base4 can wrap existing data silos for you so you can re-use them rather than creating a new silo and more headaches for the future. Base4 then exposes wrapped silos using very powerful object mapping techniques.

Go to http://www.base4.net/Base4.NET.aspx

See also these related projects.