ORMBattle.NET

Summary from product page:

"ADO.NET Entity Framework is an object-relational mapping (ORM) framework for the .NET Framework. This framework is an ORM offering from Microsoft for the .NET Framework. While Microsoft provided objects to manage the Object-relational impedance mismatch (such as a DataSet)."

Tested version: 4.0 (bundled into .NET Framework 4.0)

Test code:

• LINQ implementation (comment against each test describes if it passes or fails)
• Performance

License:

• Freeware (.NET platform component)
• Closed source

Links:

• Product page
• Wikipedia page