Crystal Space is an open source software development kit (SDK) for creating 3D virtual reality applications and games. It is a full-featured, cross-platform 3D engine and game development framework designed to be extensible and easy to use. It is written in C++ and runs on Windows, Linux, Mac OS X, and other platforms. Crystal Space's features include 3D rendering, 3D physics, networking, audio, and scripting support for creating interactive 3D applications. It also has a large library of resources such as textures, models, sounds, and shaders. Crystal Space is used to create games, virtual worlds, simulations, and other 3D applications. The SDK is free to use and can be used to create both commercial and non-commercial products.
Discontinued Abandoned since 2006 ...: http://drwatson.nobody.jp/gdi /download-en.html
OpenGL
Vulkan
WebGL
SDL
Microsoft DirectX
GLFW
Allegro
GDI
Bundleware included with Bing Bar.