Top 20 NuGet ORM Packages

Cache provider for NHibernateX using ASP.NET Cache object.
KoduStore makes marries objects and LevelDB UWP in a delightful way. It's a really basic document store with support for primary and secondary index support; this will solve most of your problems. Right now it's a PCL (for UWP).
Lightweight CSV Serializer/Deserializer for use with Tortuga Chain.
NHibernate solutions for .Net framework
Provides WITH CUBE emulation for entity framework.
Design-time Entity Framework Core Functionality for SQL Server Compact data store
Design-time Entity Framework Core Functionality for SQL Server Compact 3.5 SP2 data store
Query helpers and extensions for NHibernate.
Fluent, XML-less, compile safe, automated, convention-based mappings for NHibernate.
An extension for the MicroLite ORM Framework to encrypt and decrypt values as they are written to or read from a database.
Global exceptions logger for Entity Framework 6.x using ELMAH.
An extension for the MicroLite ORM Framework to use serilog as the logging library.
The seventh version of the configuration-less, dynamic and self-adaptive database-first oriented Kerosene ORM library, with real full support for POCO objects, natural SQL-like syntax from plain C#, and advanced maps and lazy properties.
simple and fast convention-based POCO ORM.
DCommon data adapter for Entity Framework
Provides custom extensions for the OpenAccessContext.
Реализация стандартного CRUD на базы EF Code first.
Хелпер для авторегистрации репозиториев библиотеки Rikrop.Core.Data.
EFHooks simplifies the task of hooking code into EF Code First's extension points and separates concerns to make it easy to unit test your hooking code.
A library of core helpers, extensions, constants, enums and other useful things for all .NET projects using EF.