NuGet is the package manager for .NET. The NuGet client tools provide the ability to produce and consume packages. The NuGet Gallery is the central package repository used by all package authors and consumers.

Snippet from Wikipedia: NuGet

NuGet (pronounced "New Get") is a free and open-source package manager designed for the Microsoft development platform. It was initially developed by Outercurve Foundation under the name NuPack. Since its introduction in 2010, NuGet has evolved into a larger ecosystem of tools and services.