Linux users, see https://github.com/autokey/autokey . I use it for purposes very similar to those described by the article (little automation scripts, text expansion).

It's equally as {sometimes awesome, sometimes infuriatingly quirky} as its Windows inspiration :D , but I guess it's the nature of such a tool :) .

Won't work (yet?) on Wayland, though, https://github.com/autokey/autokey/issues/87 .

For much more limited uses, which still covers a lot of what I care about, there's xdotool. A major difference is that xdotool just creates input events, but doesn't hook triggers; I just use my window manager for that.

Passersby, warning, both are Xorg-only. For wayland, see https://github.com/ReimuNotMoe/ydotool but the naming is confusing, as it doesn't work exactly at the same level: ydotool is about keystrokes, not window management.