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CrowdSec

CrowdSec · Security tools

Open-source behavior-based intrusion prevention engine whose detections feed a crowd-sourced IP reputation network, with remediation components for firewalls, proxies and CDNs

MITOpen sourceFreemiumSelf-hostedNov 2, 2026

Fail2Ban

Fail2Ban project · Security tools

Log-scanning intrusion-prevention daemon that temporarily bans IP addresses showing repeated authentication failures by updating firewall rules

GPL-2.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026

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