Top 20 NuGet ORM Packages

Provides a ChangeTrackingDbContext that will automatically updates Created and Modified fields as well as some basic DbContext extension methods from https://github.com/hoagsie/BetterEntityFramework.
Dynamic Object Relational Mapping technology for easy CRUD operations
RedBeanPHP-inspired data access layer
Lappa ORM is a object relational mapper for .NET written in C#. Supported databases are PostgreSQL and SQLite.
The Castle NHibernate proxy factory, this is an unofficial version which means it is not supported by the NHibernate team.
.Net Orm Toolkit Core Library
The enterprise data mapping pattern implemented using NHibernate.
Nhibernate-based persistence layer for IdentityServer3
Contains Oracle database adapter for Dccelerator.DataAccess ORM.
Darjeel.EntityFramework
PostgreSql provider for CoPilot.ORM
The enterprise data mapping pattern implemented using NHibernate.
ASP.NET Identity providers that use NHibernate and Sharp Architecture.
A high performance fully-async Micro-ORM for ADO.NET.
The CData SlicingDice Data Provider allows you to connect to SlicingDice using the REST API.
The CData HarperDB Data Provider allows you to use SQL to access data from a HarperDB database.
Enables you to use standard drivers to connect to Etrade objects. Just specify your credentials and access tables like Projects, Calendars, Documents, etc.
An alternative to ORM's such as Entity Framework, offers light-weight database mapping to your existing CLR objects with minimal effort. BindingSupport is net461, supporting two-way data-binding with entities.