David Hayden [MVP C#]

Richard has put together a list of O/R Mappers and Code Generators for .NET Development.  Here is the list:

• Codus (Free)
• Codesmith (Free/$)
• CSLA (Rocky Lhotka) (Free)
• DataObjects.NET ($$)
• Deklarit ($$)
• EntityBroker (Free/$$)
• Genome (Free/$$)
• Gentle.NET (Free)
• Ironspeed ($$)
• LLBLGen Pro ($)
• Modularis ($$$) 
• Neo - .NET Entity Objects (Free)
• NHibernate (Free)
• NPersist (Free)
• NOrca (Free)
• ObjectMapper ($)
• Objectz.NET ($)
• OPF.NET ($$)
• ORM.NET (Free)
• RapTier (Free/$$)
• Sooda (Free)
• Visual Developer ($$/$$$) 
• WilsonORMapper ($)
• XPO - Express Persistent Objects ($$)

I have used a number of these products and I can personally vouch for the quality of three of the products - Codesmith, Deklarit and LLBLGen Pro.  I use these products a lot and have found them to be of very good quality, and the technical support for Deklarit and LLBLGen Pro are excellent.