COSMIC
COSMIC is a desktop environment developed in the Rust programming language, using the iced cross platform GUI library for Rust, and Smithay as building blocks for its compositor, cosmic-comp. Cosmic-comp is comparable to smithay's own anvil compositor demonstration, just like the Wayland project uses Weston as demo compositor.
Installation
Currently packaged in nixpkgs master/unstable are below:
COSMIC Comp
https://github.com/NixOS/nixpkgs/tree/nixos-unstable/pkgs/applications/window-managers/cosmic/comp
COSMIC Panel
This also includes the Dock:
https://github.com/NixOS/nixpkgs/tree/nixos-unstable/pkgs/applications/window-managers/cosmic/panel
COSMIC Applet
COSMIC Settings
https://github.com/NixOS/nixpkgs/tree/master/pkgs/applications/window-managers/cosmic/settings