MegaUPS

From the developer: "Megatec compatible UPS minidriver for Windows 2000/XP. This is a freeware product which allows you to integrate your UPS with power management system of Window 2000/XP (initially Window 2000/XP contains only APC UPS driver). This software was tested with HP-500VA, OPTI-UPS 525 bt, OPTI-UPS 825 bt. It also should be suitable for several UPS models produced by Megatec (the UPS should use Megatec compatible signaling protocol)."

Requirements:

Windows 2000/XP