Top 20 NuGet app.config Packages

Useful extension methods for .Net Standard 2.0 and above.
EcConfig is a simple Nuget plugin (for Microsoft development platform including .NET) to give the control to your client of your .NET application without risking to break your service by using different file(s) than app.config or web.config files, and then some !
Easy to use tool to config transformations for JSON, XML and YAML.
Library which allows the capability to redirect your configuration sections to another source.
Super-easy DPAPI-based encrypted configuration helper
Simple and extensible way to make web.config/app.config/env vars/whatever easier to read and strongly typed!
A plugin to FeatureSwitcher to control feature switches/toggles from app.config.
This package enables you to transform your app.config or any other XML file based on the build configuration. It also adds additional tooling to help you create XML transforms.. Written by: Sayed Ibrahim Hashimi, Chuck England and Bill Hiebert
Implementation of PK.Settings for accessing settings from the application configuration file (Web.config or App.confing)
Read settings from app.config or web.config file.
Cross platform Xamarin AppSettings reader
Adds the required WebAPI controller and models to your project with the capability to manage your configuration data, as an extension to the library YourConfigIsInAnotherCastle.
Supplies JS and HTML files used to create a client side management page for your configuration. This client code is designed to work with the package YourConfigIsInAnotherCastle.Manage.Service.
Consul configuration source for Stronk.
Simple yet extensible library for mapping settings to strong types.
FluentValidation extensions for Stronk.
A simple configuration library for .NET