Red Hat is the world's leading open source technology solutions provider with offerings including Red Hat Enterprise Linux, open source applications, security and systems management, virtualization, Services Oriented Architecture (SOA) solutions.

Computer security training, certification and free resources. We specialize in computer/network security, digital forensics, application security and IT audit.

The Metasploit Framework is the open source penetration testing framework with the world's largest database of public, tested exploits.

Black Hat Conventions put you face to face with people on the cutting edge of network security, and with no vendor pitches!

SecurityFocus is the most comprehensive and trusted source of security information on the Internet.

Computer security and information security: advisories, exploits and vulnerabilities database, articles and security news.

Computer security and networking portal.

Beyond Security will help you expose your security holes and will show you what the bad guys already know about your hosts and network.

milw0rm exploits and 0day exploits database.

About Panda Security Founded in 1990, Panda Security is the world's leading provider of cloud-based security solutions, with products available in more than 23 languages and millions of users located in 195 countries around the world.