inpowerd is an inetd server that receives power event notifications over the network and notifies sysvinit about these power events. It is useful when more than one machine is connected to the same UPS but only one of them communicates with the UPS directly. The rpwrstat utility, which is distributed with inpowerd, can be used to notify inpowerd about power events. The rpwrstat utility is easy to port and currently known to work on Linux/Unix and NetWare. The rpwrstat distribution contains a compiled NetWare Loadable Module which is tested on IntraNetWare 4.11. This makes it possible to connect machines running NetWare and Linux to the same UPS.
Network UPS Tools (also known as NUT) is an extremely powerful and versatile client/server based approach to UPS monitoring. Products from a wide range of vendors (APC, Belkin, Best Power, MGE, Tripp-Lite, etc.) are supported. A shared UPS can be monitored by one host, notifcations being sent to the other hosts via authenticated TCP connections. A Web interface is available, as is a Windows client.
printerpowerd is a little Python script designed for users of older printers who want to save power when not using their printer, without manually turning it on and off. It runs, checking the printer queue directory every five seconds, turns it on when it sees a job, and turns it off after a configurable amount of idle time.
wmmge is a little dockapp for Window Maker which monitors an MGE UPS. It shows the remaining time, and it blinks if this time is short. It uses PSP (Personal Solution-Pac) monitor, which can be downloaded from the MGE website: http://www.mgeups.com. It needs root permissions to send messages to the UPS.