The Open Toolkit (OpenTK) is a set of advanced cross-platform bindings to OpenGL, OpenCL, and OpenAL for C# and other Mono/.Net languages. It can be used standalone (in the spirit of GLFW or SDL) or integrated into GTK# and WinForms applications.
openmedialibrary is a media library based on OpenGL and OpenAL. It displays media streams such as video with sound using accelerated hardware and true tridimensional capabilities.