Open Hardware Monitor is an Open Source utility that will monitor temperature sensors, voltages, fan speeds, clock speeds, and CPU core load of your machine.
It fully supports most hardware monitoring chips found on many of today's mainboards, making it an all-around monitoring utility.
With Open Hardware Monitor, you will be able to monitor the CPU temperature by reading the core temperature sensors of Intel and AMD processors, ATI and Nvidia video cards, and SMART, hard drive temperature, which can also be displayed. The monitored values can be displayed in the main window, a customizable desktop gadget, or the system tray.
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.