Top 20 NuGet configuration Packages

The migration tooling of .NET Framework application that needs to support a with Microsoft.Extensions.Hosting like syntax.
The migration tooling of .NET Framework application that needs to support a legacy configurations for Microsoft.Extensions.DependencyInjection.
The migration tooling of .NET Framework application that needs to support a with Microsoft.Extensions.DependencyInjection DI.
The migration tooling of .NET Framework application that needs to support a legacy configurations for Microsoft.FeatureManagement.
Automated registration and configuration of classes for dependency injection, CQRS. Specialized extensions for the specialized attributes. Use for middleware and CQRS.
Automated registration and configuration of classes for dependency injection, CQRS. Dependency injection extensions for the dependency injection attributes.
Tools for working with Configuration
Microsoft Azure Automanage Class Library
Adds Windows Registry support to .NET configuration system
AppyWay Configuration Providers for Dotnet
This client library is just a collection of potentially useful things relating to the configuration of things
Library for adding a writable XML configuration source/provider.
A simple library that enables Entity Framework Core DbContext as configuration source.
Configuration extensions.
A fluent .NET library for automating site and app pool creation in IIS7+.
D.C3: Distributed .NET Cloud-based Configuration Client. Use D.C3 to access an Azure Storage-based application configuration repository. Also accesses App.Config or Web.Config-based configuration objects for the Dev environment. Sample code: var configObject = (new AppConfigurationProvider()).Get...
Infrastructure project setup for building modern enterprise applications using EntityFramework or Azure Table Storage.
A configuration system based on a hierarchy of XML files, the values of which are accessed using strongly-typed configuration objects. Supports modification of the files on live service, environment variable substitution, encryption and collections. Part of the Microdot framework.