Systemometer is a unique monitoring tool that shows system activity and resources in a thumbnail window or as a screensaver. It uses the Windows NT/2000/XP performance counters and allows you to create different monitoring profiles filled up with counters that available are on your system. The program can be used on the local computer and also gather statistics from remote machines (registered version only). The interface displays the values of monitored parameters connecting all the measured points in one polygon - a snapshot view that helps to read the overall system status at a glance.
CrystalDiskInfo is an Open Source utility that monitors and displays the health of your hard drive, including basic information, S.M.A.R.T. values, and disk temperature. Also available as a portable version.
PRTG - Free Network Monitor is a network monitoring solution that ensures the availability of network components while also measuring traffic and usage.
CrystalDiskInfo Portable is an Open Source utility that monitors and displays the health of your hard drive, including basic information, S.M.A.R.T. values, and disk temperature. Also available as an installer.
Wireless Network Watcher is a small freeware monitoring tool that quickly scans your wireless network and then lists all the computers and devices that are currently connected.