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The Tenor Framework is a set of utilities to improve development of web projects, although it can be used on desktop projects. The main goal is to simplify mapping relational tables to entities, in a simple and maintainable way.
db4o is the world's leading open source object database for Java and .NET. Leverage fast native object persistence, ACID transactions, query-by-example, S.O.D.A object query API, automatic class schema evolution, small size (http://developer.db4o.com)
Framework for RAD against relational database. Supports multiple database platforms. Uses generics and partial classes. Includes a winforms Class Generatator for autogenerating O/R mapper classes based on Customisable templates.
.NET library (written in C#) for developers writing data access code that is less cumbersome than straight ADO.NET and is almost entirely database platform independent for most database platforms.