What are the most important nuget packages for asp.net mvc application.?

It is really depending on what kind of application you are working on. Choose what package suitable for your application. Below links is exclusively for NuGet packages and just refer the Top 20 NuGet packages. Have look at it.

http://nugetmusthaves.com/Category/MVC

It is really depending on what kind of application you are working on. Choose what package suitable for your application. If We need to Install Angular JS or , Scripting Language , we use the same Package .