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.
HackenProof - The world trusted Bug Bounty Platform for crypto projects
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.
Cybrary - Free courses in cyber security
Zabbix - Track, record, alert and visualize performance and availability of IT resources
CYREX - Web security vulnerability assessment & penetration testing