Disk Health Monitor is a real-time NT Event log monitor which scans for disk/controller errors of many types, and alerts you when a relevant event is generated.
Alerts types are configurable, and there are two options:
A balloon pop-up from the system tray.
An email notification to a predefined address.
* Usage on Server operating systems constitutes commercial use, and requires registration.
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.