Wikipedia
Persistor.NET
Persistor.NET is an object-oriented persistence framework which provides persistence for pure object-oriented development. Persistor .NET saves, retrieves, and deletes pure .NET Framework object graphs within a SQL Server 2005 or SQL Server Express database. The framework was developed by Hans-Peter Haberlandner and Wolfgang Portugaller in 2005.
In 2005, Persistor.NET won the "Best Visual Studio 2005 PowerToy utilizing SQL Server Express" award at the Connected Systems Developer Competition organized by Microsoft and CMP Media.