Top 20 NuGet feature Packages

Shared interfaces for RToggle
Backpack.Features is a simple c# library to support Feature Toggles (http://martinfowler.com/bliki/FeatureToggle.html)
A Feature Toggle Library for .NET
Simple static 'Feature' class that is used to wrap App.Config AppSettings to enable/disable sections of code at runtime.
Stupidly simple and lightweight feature toggle for .Net
Easy way to determine features using configurable or runtime conditions
MiniToggle is a minimal feature toggle library designed to be simple and quick.
Simple helper module for reading/writing feature switches in the web.config of a ASP web application
Sample SDK Feature Flag
Featureflow dotnet client API allows you to add runtime feature management and rollout control to your .net application. Find out more at www.featureflow.io and docs.featureflow.io
feature toggle handler for .NET modules
feature toggle handler for .NET Core modules
Featurify.Contracts provides all the necessary interfaces required to define classes required while adding the Featurify package for implementing user specific feature toggles
A FeatureSelect utility for loading features from configuration
FutureFlag.Forms: a feature flag library designed to target Xamarin.Forms
FutureFlag: a feature flag library designed to target any .net application supporting netstandard 2.0
A simple ASP.NET Core service extension to roll out some features by limiting the availability by date. - Updated to .NET Core 3.1
Use feature folders to organize controllers, pages, and views in ASP.NET Core 3.1
Simple and customizable library for managing feature toggles