Pop!_OS
Pop!_OS is an Ubuntu-based Linux distribution featuring its own GNOME-based desktop environment called COSMIC. It is designed with productivity in mind; it has fluid windows, search navigation via the Super key, workspaces that can hide clutter, and efficient auto-tiling of windows.
NebiOS
NebiOS is an Ubuntu-based desktop Linux distribution with a custom Wayland compositor called NebiDE (based on Wayfire). It features various user interface enhancements, an initial setup module called OOBE, the NebiOS App Runtime (napp-runtime) portable application format with bubblewrap containerization, improved gaming performance with Steam Proton integration, a kernel switcher for easy multi-kernel installation, and the Wine compatibility layer for running some Windows applications.