Top 20 NuGet ORM Packages

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.
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
SqlCe for Dapper.Extensions.Linq
SQLite for Dapper.Extensions.Linq
Maps POCOs to Excel files
A tiny helper-wrapper for ORM-style usage of NI.Data.DataRowDalcMapper
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).
A high performance Micro-ORM supporting Sql Server, MySQL, Sqlite, SqlCE, Firebird etc..
A small library that complements Dapper by adding basic CRUD operations (Get, Insert, Update, Delete) for your POCOs. For more advanced querying scenarios, Dapper Extensions provides a predicate system.
Spry - fluent CRUD queries using Dapper
Generates C# model classes from SQL Server tables
SQLite Helper is an open source .NETStandard library for easy storage and access of data from SQLite databases. It uses SQLitePCLRaw to provide platform independent access to sqlite. !!WARNING!! Library is currently in beta, breaking changes might occur!!
**Note this is a .NET 4 version which uses the Microsoft.Bcl.Async library to run** An extremely easy to use Micro-ORM supporting Sql Server, MySQL, PostgreSQL, Oracle, Sqlite, SqlCE. Originally Schotime's PetaPoco branch.
MySQL Provider for SimpleStack.Orm