TOML - TOML - Tom's Obvious, Minimal Language
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.
Messagepack - An efficient binary serialization format.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Protocol Buffers - A method for serializing and interchanging structured data.
Zabbix - Track, record, alert and visualize performance and availability of IT resources