Fail2ban, RdpGuard, IPBanPro, LF Intrusion Detection, AiP Defense, Cyberarms Intrusion Detection and Defense, e.guardo Smart Defender, EvlWatcher, Denyhosts, CrowdSec, Anti DDoS Guardian, Syspeace, SSHGuard, win2ban, HeatShield, IPQ BDB are some alternatives to SpyLog.