Mouse Jiggler is a very simple piece of software whose sole function is to "fake" mouse input to Windows, and jiggle the mouse pointer back and forth.
Simply run the MouseJiggle.exe included in the release .zip file. Check the "Enable jiggle?" checkbox to start jiggling the mouse pointer; uncheck it to stop. The 'Zen jiggle?' checkbox enables a mode in which the pointer is jiggled 'virtually' - the system believes it to be moving and thus screen saver activation, etc., is prevented, but the pointer does not actually move.
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Homepage:
https://github.com/cerebrate/mousejiggler
Download:
https://github.com/cerebrate/mousejiggler/releases/download/1.8.30/mousejiggler-1.8.30-net.zip