A plugin to GKrellM that displays the current CPU frequencies. The plugin was originally written by Brad Davis and update to Raspberry PI 3 by Hash13
The plugin also supports showing max, average and min CPU frequencies.
Prebuild version for Raspberry PI 3:
install: cp gkrellm-gkfreq.so /usr/lib/gkrellm2/plugins/
install-local: cp gkrellm-gkfreq.so /usr/local/lib/gkrellm2/plugins/