Keybase Chat - End-to-end encrypted chat built into Keybase
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
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.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Prometheus - An open-source systems monitoring and alerting toolkit.