Zabbix - Track, record, alert and visualize performance and availability of IT resources
FortiDDoS - FortiDDoS achieves superior & faster DDoS protection from known and zero-day attacks with low latency. Advanced DDoS protection for enterprise data centers.
Observium - Observium
nginx - A high performance free open source web server powering busiest sites on the Internet.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Kaspersky DDoS Protection - Distributed Denial of Service (DDoS) can cause financial costs for your business. Keep your service protected with Kaspersky DDoS-Protection!