• Anonymous Whois
• Anti-Malvertising Research Engine
• Arbor Networks Atlas Dashboard
• BFK Passive DNS Replication
• CIDR Report
• CleanMX Realtime
• Diagnosis Tools
• DNS Digger
• DNS Lookup
• DNS-BH Malware Domain Blocklist
• Domain Tools Whois
• Emerging Threats
• Find Parasites
• Google Safe Browsing Diagnostic
• gWebTools Whois
• hpHosts
• IP6 Conversion
• IPVoid
• Malc0de Database
• Malware Domain List
• Malware URL
• McAfee Site Advisor
• McAfee Trusted Source
• Microsoft Malware Protection Center
• Name Server Spy
• NetCraft Site Report
• Netirk Site Status
• Norton Safe Web
• PDF Void
• Project HoneyPot?
• Robtex Swiss Army Knife
• ShadowServer
• Site Check
• Snort Config Samples
• SpamHaus
• SRI Honeynet
• SRI Malware Threat Center
• Symantec Threat Explorer
• Threat Log Honeypot Database
• Unshorten URLs
• URLVoid
• Virus Total
• vURL
• Wepawet
• WhatMask
• Where Is

Get into the fight, it is easier than it has ever been to participate in open source security.

-- JamesMcQuaid - 11 Jul 2010