Kcollectd

kcollectd is a graphical front-end to collectd, a data collection service that monitors, by polling or pushed updates, system information, such as temperature or free RAM. kcollectd provides a graphical display of these collected statistics.

More generally, kcollectd can display the data stored in any round-robin database (RRD). Use the --basedir command line option to load RRDs from a non-standard location.