Consul - Consul is a solution for service discovery and configuration.
M/Monit - Monit is a free open source utility for managing and monitoring, processes, files, directories and filesystems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.
Terraform - Tool for building, changing, and versioning infrastructure safely and efficiently.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
ServiceNow - ServiceNow automates and manages global enterprise service relationships. Create a single system of record for enterprise services, automate manual tasks, consolidate legacy ITIL systems.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services