DWMBlurGlass
Add custom effect to global system title bar, support win10 and win11
...It is likely a small utility or library rather than a full game or engine, and caters to customizing the look and feel of windows for software that want a sleek transparent/blurred background aesthetic. Because its scope is narrowly defined — focusing on window rendering / UI effect — it is probably lightweight, easy to integrate in projects needing custom window decorations. This kind of project appeals to developers interested in customized UI, modded Windows applications, or aesthetic tweaks rather than full-blown applications or games. As with many small open-source utilities, using DWMBlurGlass involves incorporating its code or build into your own application so that windows render with blur/ glass-style background, giving a modern or stylized look.