Intrusion Detection and Prevention Systems

Best OSSEC alternatives and competitors

8 active tools in the same primary category, including Quad9, Trellix Intrusion Prevention System, DenyHosts, and 5 more. Open any row for the full SecurityListing profile, pricing context, and integrations.

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All 8 alternatives

Quad9
Quad9 on SecurityListing: A free DNS recursive service that blocks malicious host names and protects user privacy.
Intrusion Detection and Prevention Systems
Trellix Intrusion Prevention System
Trellix Intrusion Prevention System on SecurityListing: A next-generation intrusion prevention system that combines signature-based and behavioral detection techniques to identify and block sophisticated network threats across hybrid environments.
Intrusion Detection and Prevention Systems
DenyHosts
DenyHosts on SecurityListing: DenyHosts is a script to block SSH server attacks by automatically preventing attackers after failed login attempts.
Intrusion Detection and Prevention Systems
libnids
libnids on SecurityListing: Libnids is an implementation of an E-component of Network Intrusion Detection System that emulates the IP stack of Linux 2.0.x and offers IP defragmentation, TCP stream assembly, and TCP port scan detection.
Intrusion Detection and Prevention Systems
Suricata
Suricata on SecurityListing: Suricata offers real-time intrusion detection, intrusion prevention, and network monitoring.
Intrusion Detection and Prevention Systems
wireshark
wireshark on SecurityListing: A free, open-source network protocol analyzer for capturing and displaying packet-level data.
Intrusion Detection and Prevention Systems
Fail2ban
Fail2ban on SecurityListing: Fail2ban is a daemon that automatically bans IP addresses showing malicious behavior by monitoring log files and updating firewall rules to prevent brute-force attacks.
Intrusion Detection and Prevention Systems
BotScout.com
BotScout.com on SecurityListing: BotScout.com provides proactive bot detection, screening, and banning through a powerful API.
Intrusion Detection and Prevention Systems

FAQ

Are these “official” vendor pairings?: No. Alternatives are category peers for discovery, not paid placements. Vendors can still claim profiles and keep their product pages up to date.
Why is my favorite tool missing?: Only active listings in the same primary category appear. Multi-category products may move when their primary category is updated.