Musca has zero panels, icons, tabs, or window decorations that take up precious screen space (though these items can be added on top by installing separate apps to perform these functions).
Windows are placed in named groups which can be used in a similar fashion to virtual desktops. Groups can be added and removed on the fly, and each group has its own frame layout.
Since not all applications suit tiling, a more traditional stacking window manager mode is also available, allowing windows to float at any screen location and overlap.