SecurityFocus
- Intrusion detection focus area; designed to assist discussion on security related topics, and provides a comprehensive database of security knowledge and resources. It also hosts the BUGTRAQ mailing list.
DShield - Distributed Intrusion Detection System. Submit firewall log excerpts or browse through current activity reported to the system. Featuring a list of 10 most wanted IP addresses.
Incidents.org - Provides a public and open infrastructure for intrustion detection systems to share information about ongoing attacks that span countries, networks, and administrative boundaries.
InfoSysSec - Collection of IDS and security resources.