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 package manager designed to enable developers to share reusable code. It is a software-plus-service solution whose client app is free and open-source. The Outercurve Foundation initially created it under the name NuPack. Since its introduction in 2010, NuGet has evolved into a larger ecosystem of tools and services.