* db4o (http://www.mono-project.com/DB4O) is an open source object database for .NET and Mono, a non-intrusive persistence system that stores any complex object with one single line of code.
* NHibernate (http://wiki.nhibernate.org/display/NH/Home) NHibernate is a .NET based object persistence library for relational databases. NHibernate is a port of the excellent Java Hibernate relational persistence tool.
from http://www.mono-project.com/Database_Access
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