Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
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.
code-ray - Live debugging tool for software developers
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.
Reactime - Time travel debugging tool, visualizing and tracing state
Zabbix - Track, record, alert and visualize performance and availability of IT resources