There are several good libraries for game development with C#. Here are a few popular options:

1. Unity: Unity is a popular game engine that allows you to create games for various platforms, including desktop, mobile, and consoles. It provides a powerful visual editor, supports a wide range of programming languages (including C#), and has a large community and asset store.

1. MonoGame: MonoGame is an open-source implementation of the Microsoft XNA Framework, which allows you to create 2D and 3D games using C#. It is cross-platform, supporting Windows, Mac, Linux, iOS, Android, and more, and provides a simple, easy-to-learn API.

1. SharpDX: SharpDX is a low-level wrapper for DirectX, Microsoft's game development API. It provides access to all of DirectX's features, allowing you to create high-performance games with C#. It is particularly well-suited for 3D games and supports Windows platforms.

1. SFML.Net: SFML.Net is a .NET binding for the Simple and Fast Multimedia Library (SFML), which provides a simple, easy-to-use API for 2D game development. It supports multiple platforms and provides features such as audio, graphics, and input handling.

1. OpenTK: OpenTK is a C# wrapper for OpenGL, an open standard for 3D graphics. It provides access to all of OpenGL's features, allowing you to create high-performance 3D games. It also supports audio and input handling.

These are just a few examples of the many game development libraries available for C#. The choice of library depends on the specific needs of your game and the platforms you are targeting.
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