Top 20 NuGet Packages

A.K.A. Productivity! A powerful library to program .Net solutions in most declarative way; containing, simplest to use yet powerful, set of extensions to increase dev productivity. It exposes APIs for streaming, concurrent data processing and more. See also
Package Description
Opentribe Memento the C# open source library to manage Undo/Redo
Shortcuts library for fast WPF menuitem short cut management