.NET Extensions Methods Library for C# and VB.NET (ASP.NET, MVC, SL, WPF, EF) The .NET Extensions project provides the missing piece that you always expected to be part of the Framework Class Library.
Copy from http://dnpextensions.codeplex.com/
Fork from JoySky GitGub (https://github.com/JoySky/.NET-Extensions)
The project literally contains hundreds of extension methods for well known FCL data types. You can just add a reference and start using them today.
The original author wrote that: "Follow me on Facebook @ http://facebook.com/Kochen.mit.Patrick Or follow me on Twitter (expect less updates here) @ http://twitter.com/PatrickLorenz kick it on dotnet-kicks.de"
As full support for extension methods require .NET 3.5 this project does as well (actually SP 1). Some sub projects (eg. ASP.NET MVC) require .NET 4.0. The project compiles with Visual Studio 2010. License
The project is licensed under the Apache 2.0 license. This basically means that you can freely use it in non-commercial and as well commercial projects.