Autohotkey is a crazy dense macroing tool; I originally thought it was just move the mouse and type, but it can do so, so much more- interface with spreadsheets, web browsers, heck, there's even a tiling window manager out there that's programmed in ahk script. (bug.n)
As another example, I wrote some scripts (well, hacked together other people's work) to map MIDI CC values to a virtual joystick's Y axis, so I could use my MIDI expression pedal as an accelerator pedal in Euro Truck Simulator 2.
