View NuGet package dependency hierarchy

If you're using the new .csproj, you could get all dependencies with reference in here (after project built):

{ProjectDir}\obj\project.assets.json

I Can Has .NET Core (GitHub repository) produces nice graphs of NuGet dependencies along with a Graphviz representation. And as its name implies, you also get .NET Core compatibility information for free.

If you prefer to run it locally on your computer, I Can Has .NET Core also offers a console mode.

I add a compatible solution with the latest version of nuget-core

install-package nuget.core

This is the console App to get the dependencies graph

    class Program
    {
        static void Main()
        {
            Console.Write("Enter the local repo folder: ");
            var repoFolder = Console.ReadLine();
            
            var repo = new LocalPackageRepository(repoFolder);
            IQueryable<IPackage> packages = repo.GetPackages();
            OutputGraph(repo, packages, 0);
        }

        static void OutputGraph(LocalPackageRepository repository, IEnumerable<IPackage> packages, int depth)
        {
            foreach (IPackage package in packages)
            {
                Console.WriteLine("{0}{1} v{2}", new string(' ', depth), package.Id, package.Version);

                IList<IPackage> dependentPackages = new List<IPackage>();
                foreach (var dependencySet in package.DependencySets)
                {
                    foreach (var dependency in dependencySet.Dependencies)
                    {
                        var dependentPackage = repository.FindPackage(dependency.Id, dependency.VersionSpec, true, true);
                        if (dependentPackage != null)
                        {
                            dependentPackages.Add(dependentPackage);
                        }
                    }       
                }

                OutputGraph(repository, dependentPackages, depth + 3);
            }
        }
    }

Since this is an old question, it is important to note the following:

This is a built-in feature in the new csproj format. In Visual Studio 2017 and up, open the Solution Explorer and you can find you packages like:

{Your project}->Dependencies->Packages

You can open each NuGet dependency tree and run with it recursively, effectively seeing not only the dependency tree for specific packages, but also which NuGet packages your project actually installs.

Another option you have is to use the nuget-deps-tree npm package. It supports both the packages.config format and the newer assets format used by .NET projects.