PixelWin is a Pixelflut server written in C for Windows. It only relies on native Windows APIs, is fairly simple, quick and minimal. I have planned to microoptimize it a bit further in the future to make it even faster, but speed is not the top priority of this project and it still just runs on the CPU with a basic (still fast) algorithm.
To compile PixelWin, you need mingw64, specifically gcc. To compile in release or debug mode, simply use the corresponding batch scripts BuildRelease.bat and BuildDebug.bat.