https://allmark.io/
http://docs.observium.org/install_debian/
Observium server & client
https://vpsboard.com/threads/observium-monitoring-server-and-client-installation-tutorial.6336/
Observium user levels: http://docs.observium.org/user_levels/
Edit config.php. Change the options to reflect your installation. There you have to fill in the credentials for MySQL.
Don't change in the config, only in the Observium root directory!
/var/www/observium
https://wiki.debian.org/SNMP
Installing SNMP:
apt-get install snmpd
https://www.tecmint.com/install-squid-in-ubuntu/
https://jenkins.io/
https://www.plex.tv/
https://www.ivideon.com/ivideon-server-linux/
https://www.clearos.com/
https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-14-04
https://www.linuxbabe.com/linux-server/install-coturn-turn-server-spreed-webrtc
https://insights.ubuntu.com/2016/12/07/lxd-2-0-lxd-and-openstack-1112/