Net Activity Diagram is a Windows 95/98/NT/2000/ME/ XP/2003 application that monitors your computer network and Internet activity.
The program lets you monitor and control your network traffic. Visualizing your Internet activity is simple the program is easy, even for inexperienced users. You can view all established connections, monitor network traffic over a certain period, setup various notifications, etc.
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.