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McAfee Network Security Platform - McAfee Network Security Platform guards all your network-connected devices from zero-day and other attacks, with a cost-effective network intrusion prevention system.
Startup Stash - A curated directory of 400 resources & tools for startups
Suricata - Suricata is a high performance Network IDS, IPS and Network Security Monitoring engine.
Stackshare - StackShare is a comprehensive website that gives its users the chance to organize and share their technology stack with the rest of the community.
snort - Snort is a free and open source network intrusion prevention system.