UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!
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.
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
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.
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.
Zabbix - Track, record, alert and visualize performance and availability of IT resources