The Open Toolkit library is a fast, low-level C# wrapper for OpenGL, OpenAL & OpenCL. It also includes windowing, mouse, keyboard and joystick input and a robust and fast math library, giving you everything you need to write your own renderer or game engine. OpenTK can be used standalone or inside a GUI on Windows, Linux, Mac.

The OpenTK website

Redistributable for GLFW

A port of learnopengl.com's tutorials to OpenTK and C#.

A fast native control for OpenTK 4.x + 3.x on WPF.

WinForms control for OpenTK 4.x.

Redistributable for SDL

ObjectTK is an abstraction layer on top of OpenTK to provide OpenGL features in an object-oriented and type-safe manner with modern C#-style.

Optional (but useful) dependencies for OpenTK