This amazing hardware item will allow you to keep a computer awake while it is running and not let the screensaver kick in. Very useful for remote workers. And for less than a dollar for a limited time only. This is a great deal. Software such as ActivTrak can detect mouse jigglers, but mostly they would be very useful. For keeping your status active even when you are getting some food or in the toilet.
Buy this now.
Seenda DK16 Mouse Jiggler Undetectable Mouse Mover Shaker Simulate Mice Driver-Free Keeps Computer PC Laptop Awake
For Linux users, there is a mouse jiggler Python application here: https://github.com/carrot69/keep-presence. This will keep your computer awake whilst you are away from the PC.
Undetectable Mouse Mover, Mouse Jiggler Physical Mouse Mover with LED Display, Automatic Mouse Mover for Linux OS X Wins (White)
Here is another one, this is a platform to place your mouse on that will shake and jiggle the mouse.