PellMon is now almost trivially easy to install on a raspberry pi: https://github.com/motoz/PellMon/wiki/H ... %20PellMon
And is much easier to configure with the web based configuration file editor pellmonconf:

Has a version number, releases and a changelog: https://github.com/motoz/PellMon/releases
Upgrading howto: https://github.com/motoz/PellMon/wiki/H ... de-PellMon