Zabbix - Track, record, alert and visualize performance and availability of IT resources
AskNicely - Collect customer experience feedback on a daily basis and empower your team to take immediate action to drive retention, upgrades, reviews and referrals.
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.
Delighted - The fastest and easiest way to gather actionable feedback from your customers
Prometheus - An open-source systems monitoring and alerting toolkit.
Survicate - Collect feedback on your website and find out more about your visitors.