Top 20 NuGet data Packages

The EntLibContrib MySql Data Provider allow to use the MySql .NET Connector with the Microsoft Enterprise Library Data Access Application Block.
The EntLibContrib Query Application Block Database Extensions allow to use the Query Application Block with the Microsoft Enterprise Library Data Access Application Block.
This sample demonstrates how to use Simple.Data against a SQL Server database.
Utility for filling objects with data. Supports: Primitive Types, Arrays, IEnumerable<>, IList<>, ICollection<>, ISet<>, IDictionary<>, List<>, HashedSet<>, Dictionary<> and hopefully most of user custom classes
Unity integration for Logic Data Access
BatchFlow is a .NET library that takes care of all the plumbing you need around large batch processing, especially the producer/consumer pattern that you (probably) should use.
A free, open source developer focused object persistence for small and medium software.
The "Cocktail Async Pack for Visual Studio 2012" enables Cocktail/DevForce 2010 projects targeting .NET Framework 4.0 or Silverlight 5 to use the Async language feature in C# 5 and Visual Basic 11. This pack requires Visual Studio 2012 and will not work with Visual Studio 2010.
The "Cocktail Async Pack for Visual Studio 2012" enables Cocktail/DevForce 2010 projects targeting .NET Framework 4.0 or Silverlight 5 to use the Async language feature in C# 5 and Visual Basic 11. This pack requires Visual Studio 2012 and will not work with Visual Studio 2010.
Cocktail is an application development platform that takes the pain out of the development of data-driven rich XAML applications.
Cocktail is an application development platform that takes the pain out of the development of data-driven rich XAML applications.
Generic Repository and UnitOfWork Pattern implementation with base classes for Entity Framework
Generic Repository Pattern implementation with base classes for RavenDb
Simple database access like in WebMatrix.Data.
CSV Helpers for DHGMS DataManager. This is an extension to the Data Manager library, which contains code which has a dependancy on other 3rd party libraries.
A simple framework to build data import projects upon.
This is the CSharp client for Datalanche's REST API.
An Ektron plugin for the GoodlyFere Import framework.