Downloading and setting up (APC UPS Daemon) is one of the most effective ways to manage your uninterruptible power supply (UPS) and protect your hardware from power failures. While APC provides its own PowerChute software, many power users and sysadmins prefer apcupsd because it is open-source, lightweight, and supports complex network-based shutdown configurations. Where to Download apcupsd
Depending on your operating system, the download and installation process varies: Solved: SMT750 & PowerChute 9.2 shutdown question