Gitstalk - Discover what your favorite GitHub users are up to
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Octoview - The missing preview feature for GitHub
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.
CodeBottle - MIT-licensed reusable code snippets
Prometheus - An open-source systems monitoring and alerting toolkit.