Mouse Smoothing Software
The mouse motion data before it is used by the operating system applies a low-pass digital filter to smooth out rapid, unwanted motion caused by hand tremor. The smoothed data is then passed along to the operating system so that any program using the mouse will automatically receive smoothed mouse data.
This product is discontinued by the manufacturer, but it may still be available for purchase from third-party vendors. Try searching the product by name on the internet. Be careful as the manufacturer may no longer support it - or support it for long.