| Norton Virus-Database | Large Virus Database with an estimation of danger level.
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| Network Security Forum | Forum dealing with Security, Linux, Exploits, Wireless and Certifications |
| ZoneAlarm | Get a Firewall to protect your computer. Basic Version is good and for free. Higher versions have to be purchased |
| Spamhaus | Tracks Spammers, provides anti-spam protection for Internet networks and works to identify and pursue spammers worldwide |
| The bunker | Ultra secure computer hosting |
| BitDefender | Antivirensoftware, von der es aus eine kostenlose Version zum Download gibt. |
| Trifinite | Website about Bluetooth Security Vulnerabilities and Bluetooth Projects giving download, blog and information |
| Virus Total | Online Viruscheck: Upload suspicious files to let them be checked by several recent virusscanners. |
| Jetico | Securitytools for download: encryption, firewall and diskwiping softwaretools. |
| PhishTank | Collaborative clearing house for data and information about phishing on the Internet. Provides open API for developers. |
| Xatrix | Computer security news and information portal. |
| GNU Privacy Guard | Die freie Software-Implementierung erlaubt die Verschlüsselung und Signierung von Daten und Kommunikation. |
| stobadwar | partnership to protect Internet and computer users from threats to privacy and security caused by bad software. |
| Cexx | Website with tipps and tools against spam and spyware. |
| audit my pc | Free online firewall security and internet speed test |
| ENISA | Organization of the European Union, the EU Member States and business community to prevent information security problems |
| Haage & Partner | Hersteller von Software zur Datenrettung, Logfileanalyse sowie Serversoftware und Tools |
| Antiviruslab | Nachrichten und Informationen über Viren |
| Solved captchas | Overview of widely used captchas and information on their effectivity and weaknesses. |
| Process Information | Website that describes the processes running on computers |
| Information security | Computer and internet security news portal. |
| eicar | Organization to unite efforts against writing and proliferation of malicious code |
| TrueCrypt | Free open-source disk encryption software for Windows XP/2000/2003 and Linux |
| SenderBase | Report of spam mail traffic and virus traffic. |
| cgi security | Portal about web application security |
