Top 20 NuGet methods Packages

Common functions for CustomFramework tool
General purpose extensions methods.
A small collection of useful extension methods, utilities & helper classes.
System.Utilities.Web is a collection of helpers and extension methods for quickly solving and aiding with common .NET web related programming tasks.
PBDesk.Selenium.Extension C# Common & Useful Wrapper Utility Library over Selenium Web Drivers build for .Net 4/4.5/4.5.1
.NET Object Extension Library
The project contains some of a very useful helpers and extension methods for .NET and SharePoint.
The project contains some of a very useful helpers and extension methods for .NET and Web Applications.
Roman numerals extensions.
See Project Page for Details
MathExtensions is a library for .NET that aims to provide useful extensions methods regarding various mathematical domains, like combinatorics, sequence analysis, sequence generation, sequence manipulation, random extractions, etc.
Convert any list or IEnumerable to a properly formatted, plain-text list, with support for Oxford commas and different list item separators. Use "using static NeoSmart.TextList;" and call the extension method IEnumerable<T>.ToTextList() to return a string containing the formatted list of items.
Provides a handful of helpful extension methods for use during verification of Microsoft Roslyn Code Analysis, Code Generation, and so on. The package is intentionally left bereft of specific unit test framework dependencies.
Common extension methods
Some common dotnet helper / extension methods
A collection of basic extension methods.
Provides a handful of helpful extension methods for use during verification of Microsoft Roslyn Code Analysis, Code Generation, and so on. The package is intentionally left bereft of specific unit test framework dependencies.
Contains a lot of extension methods
A Collection of Extension Methods I find useful.