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.
...Create stored procedures, views, and tables on the database side, then use DataLG to create an assembly (and its source) to interact with them. Works with: Ms Sql Server, Sqlite 3, Mysql 4-5, and PostgreSQL.
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.
aspbeans is a framework allowing translation between bean-like .NET objects and ASP web forms, allowing forms to be mapped to an object-oriented hierarchy (with relationships like many-to-one or one-to-one). Reduces coupling and makes developers happy.