KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.
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.
AppLock (FOSS) - A privacy App lock FOSS application.
Prometheus - An open-source systems monitoring and alerting toolkit.