Apcupsd is a program for monitoring UPSes and performing a graceful computer shutdown in the event of a power failure. It runs on Linux, Mac OS/X, Win32, BSD, Solaris, and other OSes.
apcupsd monitor Events page
apcupsd monitor Information page
gapcmon V3.13.3 Preferences & Notification ICONS on top
History Page from gapcmon version 3.13.3+
apcupsd monitor Status page
list of active monitors (3), unlimited ups support in 3.13.3