Top 20 NuGet ORM Packages

Quickly test your NHibernate mappings using the PersistenceSpecification class
Various additions for NHibernate like the Include method from EntityFramework
ASP.NET Identity providers that use NHibernate.
Lightweight near zero-configuration library for easy conventional mapping for nhibernate.
A forked version of Massive (by @robconery) compatible with MySql.
Trivial micro-orm implemented on Dapper, provides with CRUD helpers. specialize to handle SQLite
F# DB Access Library for Global Transactions
Configuration-less object-relational mapper for SQL Server and SQL Server CE / SQL Server CE 4.0
The core of FastDAO, an object-relational mapper for the .NET framework
Set of extension methods representing a lightweight orm and a migration framework, for use with Dapper.
OleDb adapter for FastDAO, an object-relational mapper for the .NET framework
Trivial micro-orm implemented on Dapper, provides with CRUD helpers.
A lightweight CRUD wrapper for the Dapper Micro-ORM.
JSON ORM is an open source very lightweight framework developed on top of json.net. The Idea is to make json more quickly and easily implementable manage local storage as json.
SQLite-Net Extensions is a very simple ORM that provides cascade operations, one-to-one, one-to-many, many-to-one, many-to-many, inverse and text-blobbed relationships on top of the sqlite-net library.
A Micro-ORM for Apache Cassandra.
Provides a simple table mapping ORM for SQLitePCL.pretty.
NoSQL design ♥ SQL database - Simple NoSQL persistence and retrieval with a SQL database.
NoSQL design ♥ SQL database - Simple NoSQL persistence and retrieval with a SQL database
MySql for Dapper.Extensions.Linq