A wayland compositor based on ideas from and inspired by xmonad - GitHub - waymonad/waymonad: A wayland compositor based on ideas from and inspired by xmonad
Sway is a tiling Wayland compositor and a drop-in replacement for the i3 window manager for X11. It works with your existing i3 configuration and supports most of i3's features, plus a few extras.
Apertis uses Wayland as protocol for graphics servers, which provides a very mature and much simpler architecture than X11. The architecture is explained in Wayland compositors, however, since Wayland is just a core protocol, with some extensions defined in Wayland Protocols several different implementation can be found.
Currently Apertis uses agl-compositor, an AGL project to provide a simple compositor targeted to the automotive industry based on libweston, while older releases ship mildenhall-compositor which is a Mutter based compositor.