Top 20 NuGet extensions Packages

Extension libs and utilities of DotQuery, a lightweight query result caching framework for .NET
.NET extensions and helpers for testing.
Interactive Extensions for JavaScript library which covers the basic LINQ to Objects operations.
Contiene un conjunto de clases comunes en cualquiera de las capas bajo una arquitectura domain driven design.
CodedUI.jQueryExtensions is a simple set of extension methods for the Microsoft.VisualStudio.TestTools.UITesting.BrowserWindow class. It allows you to select and examine elements in the page under test by jQuery selector.
The extension framework to simplifies website development
A library that I tend to create for just about every project... contains extensions and other things that I find useful, you might too (or maybe not).
The frameworks provides clear conventions and separation of concerns along with selenium web driver extensions. The main goal is to build stable and easy to use framework.
Omnifactotum is the ultimate solution for .NET developers who want to streamline their development process. It provides its own helper and functional classes and interfaces as well as the extension methods for the standard .NET types. Omnifactotum is compatible with the older and newer .NET versions...
lib12 is a library of universal helpers and extensions useful in any .NET project
Portable Class Library Version of the various NotificationsExtensions NuGet Packages. Used to Create WinRT/Windows Phone Notification XML. Use instead of NotificationsExtensions.WinRT and NotificationsExtensions.UniversalApps
Community library containing extending System functionality, like Stream-, Enumerable-, Dictionary objects and more.
PortableExtensions is a set of .Net extension methods build as portable class library. PortableExtensions enhance the .Net framework by adding a bunch of methods to increase developer’s productivity.
Useful extensions/tools/utils I keep using all over the place. Hit me up (@bscheiman) if you need help.
Query helpers and extensions for NHibernate with Nancy.
Base class library for commonly occurring problems
SrkToolkit.Common contains various extension methods, validators and utility classes.