Wake On LAN Ex 2 - Free software from Joseph (AKA BootBlock) of http://www.bootblock.co.uk
WOL Magic Packet Sender - A free magic packet sender for Windows - wake-up computers with the touch of a button.
Advanced Port Scanner - Advanced Port Scanner is a fast and free software for port scanning.
gWakeOnLan - gWakeOnLan is a GTK+ utility to awake turned off computers through the Wake on LAN feature.
Wake on LAN Tool - Waking up, restarting and shutting down multiple computers made easy.
Zabbix - Track, record, alert and visualize performance and availability of IT resources