GKrellM shows details about computer configuration. It shows real time data and other information about operating system and hardware status.
View hostname, monitor CPU temperature, fan and voltage (set alarms for each sensor), monitor internet ports, view free hard drive space, view time left for a laptop battery and many more.
It shows in small and colored windows nice graphs and all kind of details about computer status and health.
Is working on multiple operating systems (Windows, Mac, Linux).