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.
Imperva SecureSphere - Get the flexibility, reliability, and performance you need to protect your business. SecureSphere covers you both on-premises or in the cloud.
SSHGuard - SSHGuard monitors services through their logging activity.
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
IPBan - Block hacking attempts on RDP, SSH, SMTP and much more
F5 NGINX - F5 NGINX is a web application security solution that allows you to protect your applications, APIs, and customer data across cloud servers, on-premises data centers, and architectures.