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Prometheus - An open-source systems monitoring and alerting toolkit.
DCImanager - DCImanager is a platform for managing physical equipment. Connect any physical equipment to a single platform. Use the platform to manage your servers, switches, PDU as well as physical and virtual networks.
runit - runit is a cross-platform Unix init scheme with service supervision, a replacement for sysvinit...
NetBox - NetBox is an open source web application designed to help manage and document computer networks. NetBox was developed specifically to address the needs of network and infrastructure engineers.
systemd - systemd is a replacement for the init daemon for Linux (either System V or BSD-style).
Opendcim - a free, web based Data Center Infrastructure Management application.