Unofficial C# Twitch.TV API Wrapper
Supports Twitch API v3 and most of v5
Supports .NET Core/.NET Standard
Official documentation can be found here
NuGet package supporting v2 and v3
Beta release of v5 support
Twitch announced the next version of their API on August 31, 2017. See link v5 was deprecated and both v3 and v5 will be removed on December 31, 2018. Because of this the next updates to this library will be updates supporting the next version of Twitch's API.