- Adobe - Security alert notification service.
- Apache - Apache Week, includes security alerts.
- Debian: Security Announcements - Security announce mailing list for Debian Linux.
- Gentoo Linux - List of security announcements and information on how to sign up to security mailing list.
- HP - Subscribe to HP Security Bulletins. Requires registration.
- Microsoft - How to subscribe to the (free) e-mail notification service that Microsoft uses to send information about security of Microsoft products.
- NetBSD - Security mailing list subscription.
- OpenBSD - All OpenBSD mailing lists, including security alerts.
- Oracle - Oracle security mailing list. Requires registration.
- Red Hat Linux - Notifications and advisories. Security mailing list subscription is on this page.
- Sun Security Information - Includes subscription instructions for the Sun security-alert mailing list. Subscribe to this list to be alerted when security patches are released. Very low volume.
- SuSE Linux - All SuSE Linux mailing lists, including security alerts.
