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.
logstash - logstash is a tool for managing events and logs.
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.
Elk - The fastest way to convert currencies on mobile.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Papertrail - Frustration-free log management. Get started in seconds.