ModMove is a tiny OS X app that takes my favorite single piece of HyperDock and does just that.
There are 2 things ModMove can do:
- To move the window under the cursor, hold Control (⌃) and Option (⌥), then move the mouse
- To resize the window under the cursor, hold Control (⌃) and Option (⌥) and Shift (⇧), then move the mouse.
$ brew cask install modmove
Or manually by downloading the latest release from here