Macro Pad driver software, written in Golang. If you have an Arduino powered device, you could use this to run various keyboard shortcuts and other macros.
What kind of macros can you make?
Shortcuts:
CTRL + C, CTRL + V, etc.
Press whatever key you want, as long as it's in the list.
Skip song, type "enter", etc.
Repeat keypresses (or mouse button presses)
Playing cookie clicker? Press your macro to repeatedly press your mouse button down until you click the macro again
More?
What kind of macros can you make?