People have already mentioned wlroots as a starting point, but there is a less opinionated and more compatible (NVIDIA-ready) library that I’m really quite fond

People have already mentioned wlroots as a starting point, but there is a less opinionated and more compatible (NVIDIA-ready) library that I’m really quite fond of called Mir: https://github.com/MirServer/mir https://github.com/MirServer/mir One thing to note, Wayland, unlike X, does not support server side decorations yet, so compositor’s responsibilities are mostly just placing windows.