What is Hummingbird Window Manager?
Hummingbird is a macOS utility that allows easy moving and resizing of windows by holding modifier keys and dragging your mouse to move and resize windows.
With Hummingbird you no longer have to hunt for the window edges or the title bar. It brings the move and resize behaviour known from Unix window managers to macOS.
Hummingbird Window Manager Screenshots
Hummingbird Window Manager information