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.
Cent - A network for Universal Creative Income.
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.
Percentages - Easy to use percentage calculator
Zabbix - Track, record, alert and visualize performance and availability of IT resources
PercentageTools.com - Percentage calculator, online calculates percentage in many situations, simply enter the numbers and get the result and the formula of calculation.