shod
Mouse-based window manager to tile windows inside floating containers
...The entire grid of tiles is called a "container", and can float around on the screen. shod works via mouse, possibly with a given modifier (Alt by default), and by responding to client messages sent by the shodc utility (shod's remote controller). With the exception of the alt-tab combination for cycling windows, shod does no keybinding by itself and relies on other applications (such as sxhkd) for that.