Exodus.io - All-in-one app to secure, manage and exchange blockchain assets.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Jaxx - Jaxx.io is a blockchain wallet available as desktop software, a mobile app, or as a Chrome extension
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.
Toshi - A browser for the Ethereum network
Prometheus - An open-source systems monitoring and alerting toolkit.