RdpGuard - RdpGuard allows you to protect your Remote Desktop (RDP), POP3, FTP, SMTP, IMAP, MSSQL, MySQL, VoIP/SIP from brute-force attacks by blocking attacker's IP address. Fail2Ban for Windows.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
SSHGuard - SSHGuard monitors services through their logging activity.
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.
IPBan - Block hacking attempts on RDP, SSH, SMTP and much more
Prometheus - An open-source systems monitoring and alerting toolkit.