Top 20 NuGet ORM Packages

MSSQL Entity Framework Core implementation of cloudscribe SimpleContent commands and queries
NHibernate.Spatial is a library of spatial extensions for NHibernate, and allows you to connect NHibernate to a spatially enabled database and manipulate geometries in HQL or in .NET code using NetTopologySuite, providing you with a fully integrated GIS programming experience.
A simple object mapper for Azure CosmosDB (ORM)
Sumo.Data.SqlServer is a Microsoft SQL Server specific implementation of Sumo.Data. Sumo.Data is an IoC capable database access framework.
Sumo.Data.Sqlite is a SQLite specific implementation of Sumo.Data. Sumo.Data is an IoC capable database access framework.
LINQ to Oracle is a data access technology that provides a run-time infrastructure for managing relational data as objects.
A high performance, low code alternative to ORM's such as Entity Framework, offers intelligent database mapping to your existing CLR objects with minimal effort. Visit "Design Goals" on GitHub to see more rationale and guidance.
Generic ADO.NET helper library to connect to a relational database system using a given providers ADO.NET driver. Driver can be in Global Assembly Cache or referenced as a nuget package.
Entity Framework: BulkSaveChanges, BulkInsert, BulkUpdate, BulkDelete, and BulkMerge. Support: SQL Server, SQL Azure, SQL Compact, Oracle, MySQL, SQLite, and PostgreSQL. This library is NOT free. FREE Trial always available for the current month.
LINQ to SqlServer is a data access technology that provides a run-time infrastructure for managing relational data as objects.
LINQ to MySql is a data access technology that provides a run-time infrastructure for managing relational data as objects.
LinqKit.Core is a free set of extensions for LINQ to SQL and Entity Framework power users. Note that Include(...), IAsync and IDbAsync are not supported.
Shared design-time components for Entity Framework Core tools.
Entity Framework: BulkSaveChanges, BulkInsert, BulkUpdate, BulkDelete, and BulkMerge. Support: SQL Server, SQL Azure, SQL Compact, Oracle, MySQL, SQLite, and PostgreSQL. This library is NOT free. FREE Trial always available for the current month.
NHibernate.Spatial is a library of spatial extensions for NHibernate, and allows you to connect NHibernate to a spatially enabled database and manipulate geometries in HQL or in .NET code using NetTopologySuite, providing you with a fully integrated GIS programming experience.
The Dapper SqlBuilder component, for building SQL queries dynamically.
Dapper.FastCrud is built around essential features of the C# 6 / VB that have finally raised the simplicity of raw SQL constructs to acceptable maintenance levels. These features leave no chance to mistypings or problems arising from db entity refactorings. Visual Studio 2015 or later is recommend...
A dynamic, lightweight, and fast repository-based ORM .NET Library.
Abp.EntityFramework
A lightweight and high-performance Object/Relational Mapping(ORM) library.