Search "free mouse jiggler" and you'll get dozens of results. Free can be perfectly reasonable for a quick, one-off need, but it's worth understanding the trade-offs before you install something on a work machine.
The risk with random free tools
Unknown free downloads are a common vector for bundled adware or worse, and unsigned apps trigger security warnings on both Windows and macOS. On a managed work laptop, installing an unvetted executable is exactly what security teams watch for.
What free versions usually lack
Most free jigglers offer a single on/off with a fixed pattern. You typically don't get randomised, human-like motion, adjustable cadence, a proper signed installer, cross-device coverage, or updates. Those are the details that make a jiggler reliable and unobtrusive.
What you get for a few dollars
Virtual Mouse Jiggler is signed and notarized, uses genuine randomised cursor motion, lets you tune the interval, updates itself automatically, and covers Mac, Windows, and Chrome on one subscription. There's a free trial (3 days on Mac and Windows, an hour in Chrome), so you can confirm it fits before you pay. For something you'll run on your main work machine, that peace of mind is the point.