Top 20 NuGet ORM Packages

A .NET 4.5 library which adds an extension for the MicroLite ORM Framework to use log4net as the logging library.
SQLite + NHibernate пакет для Zen.Core
N-Tier Entity Framework WCF RIA Services base library and T4 code generation templates.
Dapper.Fluent is a small and easy library that supports fluent API for query construction and execution over database connection using Dapper.Net.
Infrastructure.RavenDB
F# DB Access Library
JUnit Orm Framework for dotnet2.0
NHibernate drivers to support integration with MiniProfiler.
FastData is a simple and fast .NET micro ORM that can be used as ultra-fast data access layer of high-performance .NET projects.
IvyORM is an extremely simple yet powerful Micro-ORM that extends DbConnection and DbTransaction. With IvyORM boilerplate code is reduced while keeping SQL a first class citizen.
JUnit Orm Framework
An easy to use Repository and UnitOfWork pattern for NHibernate.
A simple .NET assembly that provides an object-relational mapping abstraction layer for geodatabase feature classes and tables. It converts features and rows into a (lazy) sequence of strongly-typed objects. *Requires ArcGIS Desktop, Engine or Server 10.0, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, ...
ORM for SQL Server, with support for table valued parameters, multiple resultsets, etc. Full async support!
TypeSql compiles annotated SQL into strongly-typed data-access-objects
EntityFramework DbContext Extension Helper.
A light weight framework that provides implementations of commonly used design patterns for applications using a Domain Driven Design approach.
A .NET 4.5 library which adds an extension for the MicroLite ORM Framework to integrate with ASP.NET WebApi.
Easiest and fastest Micro ORM, you've got the queries, you've got the objects, take the best of two worlds ! This is only the core, you should reference an existing database provider.
Entity Framework is Microsoft's recommended data access technology for new applications.