ManageEngine ADAudit - ManageEngine ADAudit is a real-time windows active directory auditing tool.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Spectrum - Browser-based app to visualize the frequencies of an audio file.
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.
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
Prometheus - An open-source systems monitoring and alerting toolkit.