UPS Assistant is described as 'A tiny free UPS monitoring program for Megatec/Winpower protocol based (Ippon, Mustek, Sven, Inelt) hardware. Provides access to all UPS signals and functions at zero CPU or disk cost'. There are three alternatives to UPS Assistant for Linux, Mac and Windows. The best alternative is Network UPS Tools, which is both free and Open Source. Other great apps like UPS Assistant are Winpower (Free) and PowerChute (Free Personal).
WinPower is a powerful UPS monitoring software, which provides user-friendly interface to monitor and control your Inverter system. The software provides complete power protection for computer system while encountering power failure.