Xamarin.Build.Download by: Microsoft

Support for downloading and unpacking archives when building MSBuild projects

Xamarin.AndroidX.Migration by: Microsoft

This package provides a set of tools and MSBuild tasks to aid in the migration from Android Support to Android X.

Xamarin.Android.Support.v7.AppCompat by: Xamarin Inc.

v7 AppCompat Android Support Library C# bindings for Xamarin

Xamarin.Android.Support.Vector.Drawable by: Xamarin Inc.

Vector Drawable Android Support Library C# bindings for Xamarin