Top 20 NuGet appsetting Packages

Type-safe, easy and power configuration framework for .NET developers
Load application settings into strong typed objects with two lines of code. Supports validation, nested objects, arrays, lists and dictionaries.
This package contains utilities for logging and app setting. It includes versions for .NET Framework 4.0, 4.5, 4.5.1, and 4.5.2.
A simple tool to allow you to quickly pull an application setting from your web or console app, while specifying its return type.
WcfHelper.Mock helps for develope Unittests for Wcf-Clients.
Essentials for .NET Core application.
WcfHelper helps for develope Wcf-Clients.
A lightweight library to load application configuration settings into a dictionary.
SimplifiedConfiguration makes it a breeze to read the config file settings. It's APIs makes it unnecessary to specify the app settings key and rather derive the key from the property name.
.NET Core configuration reader