Json.NET is a popular high-performance JSON framework for .NET

This strongly-typed, client library enables working with Elasticsearch. It is the official client maintained and supported by Elastic.

Google APIs Client Library for .NET

Stripe.net is a sync/async .NET 4.6.1+ client, and a portable class library for stripe.com.

Microsoft's OWIN implementation, the Katana project

DevArchitecture Backend Project

.NET SDK for Azure Cosmos DB for the core SQL API

Twilio C#/.NET Helper Library for .NET6+.

iyzipay api .net client

Extra utilities for use with the Selenium .NET language bindings

The NuGet package include Selenium Google Chrome Driver files for Win32, macOS, and Linux.

Rollbar for .NET

Mixpanel C# integration library

Intercom API client library for .NET

.NET bindings for the Rollbar.com error reporting service.