Cloudflare Spectrum - DDoS protection for TCP services
Platypus - Realtime server monitoring and reporting
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
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.
Vanta - Automate compliance, simplify security.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services