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Or roll up your sleeves and dig into xset, xautomation (a.k.a. XAUT), wmctrl, xte, xbindkeys, and others, which can all be scripted.

Autokey is a good alternative. But it depends on your window manager, for example, you might benefit from xbindkeys or i3 config.

I am highly surprised how many times i3 is mentionned in all the comments.

xdotool + bash and other utils.