Top 20 NuGet configuration Packages

Bitifier.Configuration simplifies centralized configuration.
A plugin for Cake for environment-based configuration transformations
Simplifies configuring .net applications.
Reads main and local assembly configurations.
Rapidly create and edit microservices configurations
Kinetix Configuration Module
Simple syntactic sugar for ConfigurationManager
An easy way to read custom configuration
Utilities package for running in Microsoft Azure.
An NLog Layout Renderer that utilizes Azure Cloud Configuration Manager
Stupidly simple and lightweight feature toggle for .Net
.NET client for Configius.
This library allows you to create strongly-types application settings in your .NET projects. Application settings are stored in XML files, much similar in form and intent to the appSettings tag in your web.config or app.config files.
Simple configuration library
Provides support for configuring Asp.Net Core applications with Consul
StaticDotNet.EntityFrameworkCore.ModelConfiguration provides a way to configure entities outside of DbContext.OnModelCreating without having to add custom code to your DbContext.
A wrapper for ConfigurationManager or WebConfigurationManager to help with unit testing and dependency injection.
An interface for ConfigurationManager or WebConfigurationManager to help with unit testing and dependency injection.