Lockinfo - You can find this app in Cydia - Tweaks.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Springtomize - Tear down the walls
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.
Cylinder - Sexy homescreen icon animations
Prometheus - An open-source systems monitoring and alerting toolkit.