Do You Even List? - Auto updating Twitter list of people you interact with most
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Electoral - Rock your Twitter lists
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.
Refined Twitter - A browser extension that improves the Twitter experience
Prometheus - An open-source systems monitoring and alerting toolkit.