[rietta]

Thousands is probably hyperbole, but there are many, many!

One that I find regular use for when copy+paste does not work because I am either connected to a terminal emulation, vm, or something of the like is typeitforme. It takes the contents of a text file and sends them through the keyboard buffer after a few second delay (that allows me time to switch focus to the window I want the typing done).

I currently have it as a entry in my ~/.bash_aliasas file.

alias typeitforme='sleep 3 && xdotool type --file '

This works in stock Ubuntu Linux. You can check out the xdotool documentation for ideas how to refine it to do more.