Genome
Gentle.NET
最新版：1.2.5，发布日期：2005.7.15
下载:http://easynews.dl.sourceforge.net/sourceforge/gopf/Gentle.NET-1.2.5.zip
JC Persistent Framework
LLBLGen Pro
ModelWorks
Nhibernate
Neo
Nolics.NET
Norm
Norpheme
ObjectBroker
ObjectPersistor.NET
ObjectSpaces
ObjectSpark
Objectz.NET
OJB.NET
OPF.Net (Object Persistent Framework)
ORM.NET
Olymars
Pragmatier Data Tier Builder
RapTier
Sisyphus Persistence Framework
TierDeveloper
Versant Open Access
Wilson's OR Mapper
其它框架
Data Access Library
Data Access and Transaction Framework
Unified DataAccess Framework
Provider Factory
Generic ADO.NET
Abstract ADO.NET
比较多的是商业软件，开源的很多不成熟。
另外：
http://www.cnblogs.com/huqingyu/archive/2004/07/29/28263.html