Core Temp is a compact, no-fuss, small-footprint program to monitor CPU temperature.
Core Temp's uniqueness is that it shows the temperature of each core in each processor in your system. You can see in real-time how the CPU temperature varies when you load your CPU.
Intel and AMD published detailed public information about the "DTS" (Digital Thermal Sensor), which provides much higher accuracy and more relevant temperature reading than the standard thermal diode sensors do.
This feature is supported on all Intel Core and Core 2 series of processors and the whole of AMD's AMD64 line of CPUs. (for a full list of supported CPUs: (CPU Support List).
Core Temp also has a logging feature, allowing a user to easily record the temperature of his processor(s) over any time. The data can be easily transferred into an excel datasheet for easy graphing.
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.