Advanced Port Scanner - Advanced Port Scanner is a fast and free software for port scanning.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
WakeMeOnLan - Turn on computers on your local area network by sending Wake-on-LAN packets.
AppZero - AppZero is a monitoring and migration tool that allows users to keep track of different applications and servers in both simple and complex IT environments.
Wake On LAN Ex 2 - Free software from Joseph (AKA BootBlock) of http://www.bootblock.co.uk
CULA - A webmonitoring solution for beginners and pros.