OpenTK, also known as The Open Toolkit library, is a C# graphics library superseding the Tao Framework.

[1] It provides access to graphics tools contained in OpenGL, OpenCL, and OpenAL to a variety of CLR-based languages (C#, F#, etc.).

[2] Particularly, it is usable with any language utilizing either of the .NET Framework or Mono frameworks[3] for versions prior to 4.0 and .NET Core 3.1 and up, continuing with .NET 5, for major version 4.

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