Unity engine , the most popular game engine based on mono. Also gnome software like glib , cairo , harfbuzz prolly used as foundation by all OSes, gui toolkit, programming language or browser on the market.
I don't make games so probably not using Unity. I also don't think gnome software like glib and cairo is the "foundation" of the OS I use like macOS. Are you sure you're not a Miguel de Icaza alt account?
I don't make games so probably not using Unity. I also don't think gnome software like glib and cairo is the "foundation" of the OS I use like macOS. Are you sure you're not a Miguel de Icaza alt account?