The Open Toolkit library is an advanced, low-level C# wrapper around OpenGL, OpenCL and OpenAL. It is suitable for games, scientific applications and any other project that requires 3D graphics, audio or compute functionality. Version 1.0 beta-1 introduces type-safe OpenGL ES 2.0 binding and a large number of new OpenGL tutorials on triangle picking, shaders, cubemaps and vertex buffer objects. It also contains a significant number of bug- and stability fixes; improves multi-monitor support; and improves support for multi-threading. Due to the amount and impact of the included bug fixes, users of previous versions are strongly encouraged to upgrade.