Top 20 NuGet appsettings Packages

A long description of the package. This shows up in the right pane of the Add Package Dialog as well as in the Package Manager Console when listing packages using the Get-Package command.
Enables appsettings reload onchange also drop dependency on IOptions<T>
A .NET configuration library to simplify application configuration
Contains an implementation of sink for Microsoft ConfigBuilder for the Invisionware Settings Library
This package provides a base app settings capability deserialising environment variables into IConfiguration object.
The Config Helper Pro Library has the ability to manage all your .NET configuration needs. Read/write to the registry, application/web config, and INI files with a single line of code. Everything is 100% managed code.
Makes mapping key/value stores (appSettings, environment variables, NameValueCollections...) to POCs dead simple and highly extensible.
Provides a wrapper around ConfigurationManager.AppSettings to allow dependency injections
The dynamic configuration manager for .NET
Reads settings from the appSettings section of your configuration by convention.
Reading a setting from App.config or Web.config is a pretty common task. Here's a class that makes this loads easier: AppSettingsUtil Easily read application setting values in a variety of types, specifying default values if necessary.
Initialize CORS Policies via appsettings.json or your own configuration json file.
Simple and extensible way to make web.config/app.config/env vars/whatever easier to read and strongly typed!
Contains an implementation of sink for System ConfigurationManager for the Invisionware Settings Library
Contains an implementation of Sink Read/Write for AzureConfigurationManager for the Invisionware Settings Library
AppSettings.Unity is an extension to parse AppSettings in app.config( web.config) section into specified DOM.
An IConfigurationBuilder for HashiCorp vault
DevAttic ConfigCrypter is a library that enables the user to work with decrypted configuration files.