GNOME’s Mutter isn’t built with wlroots either:
Compositors
- Cagebreak - A Wayland tiling compositor inspired by Ratpoison
- Cardboard - A scrollable tiling Wayland compositor
- dwl - dwm for Wayland
- epd-wm - Wayland window manager that outputs to IT8951 E-Paper displays.
- hikari - A hybrid stacking/tiling Wayland compositor
- Hopalong - Simple Wayland compositor with a featureset comparable to XFWM
- Hyprland - A dynamic tiling Wayland compositor that doesn’t sacrifice on its looks
- kiwmi - A fully programmable Wayland Compositor
- labwc - A stacking Wayland compositor with look and feel of openbox
- laikawm - A stacking Wayland compositor with look and feel of openbox
- phoc - Wayland compositor for mobile phones like the Librem 5 (designed to work with phosh)
- river - A dynamic tiling Wayland compositor
- Sway - i3-compatible Wayland compositor
- tinybox - tries to emulate the blackbox, fluxbox, openbox family of wm
- Waybox - An openbox clone on Wayland
- Wayfire - 3D Wayland compositor
- wio - Wayland compositor similar to plan9’s rio
Note that the above list was last updated 3 years ago, so it may not contain all the current wlroots compositors.