Top 20 NuGet helper Packages

The Relativity API Helpers include interfaces that you can program against when developing agents, custom pages, and event handlers. They provide the ability to write common code for sharing across these extensibility points, simplifying your development processes and facilitating code reusability.
A high performance micro sql helper supporting SQL Server、MySQL、PostgreSQL
A number of simple methods to test database objects and execute sql. Currently supports Microsoft SQL Server databases.
ASP.NET Core tag helpers for Subresource Integrity (SRI), Referrer meta tags, OpenGraph (Facebook) and Twitter social network meta tags.
Contains shared dll's and managers for comman .net programming and operations.
Azure implement for StorageMate.Core interfaces. Including Table/Blob based implementing.
MCART for Windows Presentation Framework
MCART .Net Standard Edition
A set of generic helper methods and classes for .NET Framework
EnumUtils provides some essential enum helper methods.
Facilitate logs, and other functionalities when building a .Net application
Provides collection-related convenience/helper methods.
Test helpers for CoreDdd library
Experience is a useful, clean and fast functions library for .NET Projects. You can find the project wiki here:
MCART Lite Edition
Persistence test helpers for CoreDdd library
Implementation of pattern "Unit Of Work" for EntityFramework Core with some helpful features like integrated paging, transactions and other things
Genesis.Repository is a library that makes it simpler to implement database repositories, particularly within a mobile application.
A .NET Standard 2.0 library of helpers and extensions for working with SOAP payloads in the Nancy web framework.
Helpers for CoreDdd library