OISF/suricata

Snort++

Zeek is a powerful network analysis framework that is much different from the typical IDS you may know.

Modular and decentralised honeypot

Slips, a free software behavioral Python intrusion prevention system (IDS/IPS) that uses machine learning to detect malicious behaviors in the network traffic. Stratosphere Laboratory, AIC, FEL, CVUT in Prague.

Real-time eBPF-powered network security monitor with AI-driven threat detection. Surfaces port scans, DDoS attacks, botnet activity, and anomalies at 100Gbps+ speeds with sub-microsecond latency (~150 million packets/sec).

Advanced Python-based Intrusion Detection System (IDS) featuring a real-time dashboard, GeoIP analysis, email alerts, and firewall integration for network threat monitoring and response.

Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. It includes our own interfaces for alerting, dashboards, hunting, PCAP, detections, and case management. It also includes other tools such as osquery, CyberChef, Elasticsearch, Logstash, Kibana, Suricata, and Zeek.

Blazing-Fast Token-Efficient Intrusion Detection System (IDS) based on TypeSafe's Jev.

NIPS — Machine-Learning-Based Network Intrusion Prevention System | Kitsune/LUCID integrated | Online unsupervised anomaly detection | Kernel-level real-time traffic interception | FastAPI + CLI management