AirSnare is an intrusion detection system to help you monitor your wireless network. AirSnare will alert you to unfriendly MAC addresses on your network as well as to DHCP requests. If AirSnare detects an unfriendly MAC address, you have the option of tracking its access to IP addresses and ports or of launching Ethereal.
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.