ManageEngine M365 Manager Plus - Auditing, monitoring and reporting tool for Office 365
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.
Secure Suite - Cloud Email service
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Adaxes - Automate active directory
Zabbix - Track, record, alert and visualize performance and availability of IT resources