nosleepy

Keeps your system active by simulating mouse movement, key presses,
or realistic typed input into a hidden sink window — never your active window.

Modes: mouse, keyboard, both, scroll, xlib, xdotool

Recommended usage:
nosleepy -m xlib --pause 37 --words 30

GitHub: https://github.com/it-harsh/nosleepy
PyPI: https://pypi.org/project/nosleepy/