Top 20 NuGet pattern Packages

Design and build-time code-gen for records, unions, lenses and immutable With functions
Support for Reactive Extensions overloads for various types in the LanguageExt.Core
This library uses and abuses the features of C# to provide a functional 'Base class library', that, if you squint, can look like extensions to the language itself.
The #1 pattern-aware extension to C# and VB.
Parser combinators library based on Haskell Parsec. This is part of the LanguageExt functional base class library and requires LanguageExt.Core
Helper library for LanguageExt.Core that facilitates conversion between F# native types like Option, Map, List, etc to .NET and Language Ext types.
Provides a set of useful classes when implementing a disposable or dealing with disposables. Part of the "Open" set of libraries.
DotNetCore.EntityFrameworkCore
A fast globbing library for .NET applications, including .net core. Doesn't use Regex.
The Cuemon.Core assembly is the patriarch of the Cuemon .NET Standard family and provides fundamental-, utility- and base-classes that define commonly-used value and reference data types, events and event handlers, interfaces, attribute, and feature rich delegates to greatly support functional progr...
DotNetCore.Repositories
DotNetCore.MongoDB
DotNetCore.Results
This is an opinionated approach that NativoPlus Studio handles request response pattern
Extensions for HttpClient and Custom Repository based on dapper
DotNetCore.Mediator
eQuantic Core Data Class Library
Tokenizer extracts structured information from blocks of text and reflects them onto .NET objects
Library with various static classes and tools that provide universally useful functions, extensions and utilities.
Generic repository base pattern for EF Core + AutoMapper. Able to handle both UID and non entities