Zabbix - Track, record, alert and visualize performance and availability of IT resources
Zylo - Zylo helps organizations optimize their SaaS investments by providing insights around Spend, Utilization, and User Feedback.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Zluri - SaaS Management and Identity Governance Platform for IT Teams
Prometheus - An open-source systems monitoring and alerting toolkit.
Blissfully - Blissfully offers solutions to track, manage, and optimize SaaS spendings.