Top 20 NuGet ORM Packages

Provides an NHibernate driver that uses the Microsoft Transient Fault Handling library to allow for reliable SQL Azure connections. This package has the Microsoft Transient Fault Handling library IL-merged into it; for a version that doesn't see the NHibernate.SqlAzure.Standalone package.
EF Entity Pool Repository
KORM.MsAccess is fast, easy to use, micro .NET ORM tool for MsAccess. (Kros Object Relation Mapper)
Fast Bulk insert extension for SqlServerCe using EntityFramework 6
SolucionesEnLinea.com Database Access Framework based on Reflection and ADO.NET. Sel.Data provides access to Database providers (default for mssql).
Fast Bulk insert extension for EntityFramework 6
Simple Get, GetList, GetListPaged, Insert, Update, Delete, DeleteList, and RecordCount extensions for Dapper. Uses smart defaults for attribute free classes but can be overridden as needed. By default uses Id column as the primary key but this can be overridden with an attribute By default qu...
PostgreSQL database provider for OpenCQRS domain store.
Dapper extension adding outside sql function reading text file.
A tiny helper library for creating database integration tests
Sql data access library and object mapper that i've used over the years. Provides simple and straight forward data access/mapping that favors convention over configuration.
EntityFrameworkCore implementation of DevAccelerate Subscriptions library.
A helpful set of C# extensions used to map database results to object models.
Fast Bulk insert update extension for EntityFramework 6
It provides a base class called Business Entities Structure (Base Model) used to map automatticaly the properties without using reflection from the database/datasource
Allows SQL Server Compact 4.0 to be used with Z.EntityFramework.Classic (Community & Enterprise)
SqlFun is a tool for writing data access code in F# functional way. It's fast, type safe and gives you all powers of SQL, no custom query language constraints you. It's also lightweight, you need to know a general idea and few functions (and, of course SQL).
A high performance Micro-ORM supporting SQL Server, MySQL, Sqlite, SqlCE, Firebird etc..
This ContextIdea Data with Entity Framework