Microsoft Security - Microsoft-product-related security headlines and bulletins. FreeBSD Patches FTP Site - Security advisories and patches. AIX - Security and other patches for AIX. Note that this is an FTP site. AIX Patches - Fixdist - You need the "fixdist" program to install AIX patches. Debian: Security Information - Details of current and archive security advisories. Includes mailing list and a security FAQ. HP-UX Patch Additional Information - Patch Security Matrix, list of obsolete patches, patch checksums. OpenBSD Release Errata - Advisories and patches. KDE - Only if you've built KDE yourself; otherwise probably available from your Linux distribution vendor's patches directory. Note this is an FTP site. OpenBSD Security - Advisories and information. FreeBSD - Advisories, mailing lists, tips, tricks, guidelines, links. NetBSD - Advisories, patches, links. Apache Web Server - Advisories and patches. SCO Unix System Security Enhancement Area - Advisories and patches. Note this is an FTP site. Red Hat Linux Errata - Security advisories and updates (patches) for all supported versions. Compaq - Patches and advisories for most Compaq products. HP: Tru64 Unix - Security advisories and associated patches. Cisco - Patches and advisories for Cisco products SGI: IRIX - Security advisories and patch downloads. Includes mailing list. HP: IT Resource Center - Americas/Asia-Pacific site offering online support. Includes knowledge base, patches, drivers and security mailing lists. Adobe - Security bulletins and technical briefs that provide information to customers. Microsoft - Download security updates, service packs, and anti-spyware tools for Windows.