Top 20 NuGet ORM Packages

Pre-release and experimental implementations of potential future library features. No support is provided; use this to provide feedback and help shape ODataLib's future. Targets .Net 4.0.
Crow is an Experimental Open Source framework that aims to help developers for creating and managing new applications easily. Main purpose is to create agile, easy to test, aspect oriented applications.
An data access component. It provides a library of classes and a tool, using it in .net project can make data accessing more easily.
Object-relational mapping framework built using the Gang of Four's "Flyweight" pattern.
A minimal stored procedure based orm using xml.
Dino Core Components
EFHooks simplifies the task of hooking code into EF Code First's extension points and separates concerns to make it easy to unit test your hooking code.
ADO.NET Modernizer
Leafing Framework
Blueprinting is a library designed to assist in the creation of large collections of complex objects, especially for use in testing or database seeding tasks.
A basic lightweight object relational mapper (ORM) for .NET.
Classic data access layer is nothing but querying data from database, extracting & packing data into CLR typed classes. Classic DAL Helpers makes it easier for back-end layers, especially for Data Access Objects to extract and fill data. Its developed in Microsoft .NET 3.5, C#.
Configuration-less object-relational mapper for SQL Server and SQL Server CE
XGENO.DBMapper is a simple, easy-to-use and powerful OR Mapper (just 15KB) for your database queries. It is set of extension methods (on the SQL Connection), which execute a SQL query (simple, parameterized, stored procs etc.) and return the data as a list of .NET objects (classes that you have crea...
Translates computed properties in LINQ queries into their implementation (based on Microsoft.Linq.Translations).
Mvc stuff for sitecore
Zero Framework is .NET based framework for rapid development of thick client applications using agile methodologies. It uses EF Code First, Caliburn.Micro, custom message-based comunication running over WCF and MEF for dependency resolution.
Obj2Schema generates a SQL schema from object metadata. Lightweight and flexible, it supports SQL Server, MySql and Sqlite SQL dialects, and is easily extendable It allows for straight translation from .NET to SQL types, but does not yet generate relations.
Security Library for NHibernate