Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Request Tracker - open-source enterprise grade issue and ticket tracking system
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.
NetHelpDesk - Leading provider of help desk software and customer support software. Trusted by IT professionals and service desks for over 20 years.
Prometheus - An open-source systems monitoring and alerting toolkit.