snort is described as 'Snort® is an open source network intrusion prevention and detection system (IDS/IPS) developed by Sourcefire. Combining the benefits of signature, protocol, and anomaly-based inspection, Snort is the most widely deployed IDS/IPS technology worldwide' and is a Network Monitor in the Network & Admin category. There are five alternatives to snort for Mac, Windows, Linux, BSD and FreeBSD. The best alternative is Suricata, which is both free and Open Source. Other great apps like snort are Yang (Paid), Network Hotfix Scanner (Free), Redborder (Free, Open Source) and cvechecker (Free).
Suricata is a high performance Network IDS, IPS and Network Security Monitoring engine. Open Source and owned by a community run non-profit foundation, the Open Information Security Foundation (OISF). Suricata is developed by the OISF and its supporting vendors.
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Almost everyone thinks Suricata is a great alternative to snort.
redborder is an Open Source, Big Data cybersecurity and traffic analysis platform accompanied by a set of active probes managed in an integrated manner. Can be deployed on-premise or used as a cloud service. Managing SNORT events.