Top 20 NuGet utility Packages

Rich http Client
Web and business layer connectors
String extension methods for .NET
If your project is using both mandrill and mailchimp, this would be a nice choice.
Theta is a shell engine for building command line applications providing an easy to use API, advanced command line parsing, and a rich flexible feature set.
DotBPE.Utils是一些常用的类库和帮助类
This dll is a collection of useful .Net 2.0 utilities that I have used extensively over the years
SolucionesEnLinea.com Database Access Framework based on Reflection and ADO.NET. Sel.Configuration provides access to configuration information provider (default for .net is app.config/web.config file).
A lightweight and easy-to-use C# graphics library backed by DirectX 11.
Simple Settings from Environment Variable.
Common utilities for c#
Lazy Console Utility -> Just pass in a type with methods and let it run!
.net standard library that compares even the most complex collections of objects. Using reflection, the comparer checks if each and every object is identical in both collections and returns true if so. (including custom objects, lists... anything)